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Mining risk

Publish: 2021-03-26 04:08:04
1. In short, cloud computing power can avoid the tedious steps of mining,
mining machine setting, mining noise and so on. Digyi mining can provide such services.
2.

As of July 24, 2020, the state has not issued any laws to prove that bitcoin mining machine is illegal

bitcoin mining machine is one of the ways to obtain bitcoin. Bitcoin is a kind of network virtual currency proced by open source P2P software

it doesn't rely on the issuance of specific monetary institutions, and it is generated through a large number of calculations of specific algorithms. Bitcoin economy uses a distributed database composed of many nodes in the whole P2P network to confirm and record all transactions. The decentralized nature and algorithm of P2P can ensure that it is impossible to artificially manipulate the value of bitcoin through mass proction

extended data

the issue and transaction of bitcoin are realized by mining, and it is cast at a certain but slowing rate. Each new block is accompanied by a certain number of new bitcoin from scratch, which is used as a coinbase transaction to reward the miners who find the block

the reward for each block is not fixed. For every 210000 blocks mined, it takes about four years, and the currency issuance rate is reced by 50%. In the first four years of bitcoin's operation, each block created 50 new bitcoins. Each block creates 12.5 new bitcoins. In addition to the block award, the miner will receive a handling fee for all transactions within the block<

source: Internet - bitcoin mining machine

3. It's OK, but it's very difficult. It's a lot of brain work. It's better to play on chips. You can get income by shaking it, and then you can directly exchange it for withdrawal bitcoin. It's simpler
4. Filecoin can be understood as a kind of virtual currency derived from IPFs, an innovative Internet technology. At the beginning of its creation, it was intended to promote the development of IPFs, encourage the spread of IPFs among the population, and let the participating resource contributors get corresponding rewards according to their effective contributions. These rewards are issued in the form of filecoin, The value of filecoin is mainly reflected in the proportion of IPFs in the future Internet application audience. The healthier the ecological trend of IPFs, the higher the value of filecoin in the later stage. For investors, the practicability of IPFs directly leads to the inestimable value of filecoin as its only recognized virtual currency, and some business opportunities can be seen more clearly. If you invest, you can buy the corresponding mining machine on our platform, and you can invest less than 100000 to join.
5. 1、 Singapore
1, intelligent mobile
Singapore adopts intelligent Internet transportation solutions, and adopts strong policies to limit car ownership, so as to rece the number of vehicles on the road. This vision makes Singapore an ideal place to try smart car alternatives on the basis of sharing economy. Singapore is one of the first to have bike sharing (obike, ofo, mobike) and the second largest electric vehicle sharing program (bluesg) after Paris. The next step will be nutonomy's on-demand driverless taxi
, a by-proct of the Singapore MIT research and technology alliance. The project was launched in July 2015, with its first public pilot in 2016 and full implementation in 2017. Nutonomy's team worked closely with the government to turn the vision into reality. They hope to operate the first autopilot in five years. Singapore's new town will be based on the concept of self driving cars. For example, there may be more green areas to replace unnecessary parking
2. Intelligent infrastructure
virtual Singapore is an ambitious project to be completed in 2018. It allows scientists and urban planners to experiment and simulate with data rich 3D models of Singapore at the click of a button. When you see the representation of a building, the computer knows what type of building it is and what kind of roof, walls, doors and windows it has. So you can find all the roof surfaces of a building at a certain height and calculate how much energy can be generated by installing solar panels on the building
3. Elderly inclusion
Singapore is committed to providing medical services for elderly citizens through a series of technologies, including digital service platform and remote monitoring equipment. Among other initiatives, access health international, a Singapore think tank, and Singaporean enterprises jointly created the modern aging Singapore, a business competition and incubator, in 2015. Each year, the winners will receive a grant to develop their ideas over the next three years. The winners presented their innovation at innovfest
4. Security
Singapore is considered to be one of the safest places in the world. It ranks second in the 2017 safe city index after Tokyo. Since 2012, more than 52000 police surveillance cameras have been installed in the city
5. Convenient public services
the Singapore government has also accelerated the delivery of key strategic national projects, including singpass, the national digital identity portal, the adoption of paynow to make electronic payment more integrated and interoperable, and the use of instant life applications to solve citizens' pain points in transactions with the government< Seoul, South Korea is a typical example of smart city in mitigating climate change
according to the Deloitte City mobility index 2018 (June 11, 2018), Seoul is the leader of innovative environmental sustainable development program in Asia Oceania region
with regard to transportation, Korean cities aim to electrify all buses in order to achieve zero emissions by 2030. By 2022, the number of fast charging stations for electric vehicles will increase to 10000 and mail delivery will be powered up
on a smaller scale, sipjaseong villagers in Southeast Seoul have successfully met their own energy needs. They've found several solutions to get 46% of their electricity from renewable sources. The roof of the building is equipped with solar panels, the house keeps heat through the sealing system of windows, and reces power consumption by using LED lights
2. Intelligent mobile
with the continuous collection of real-time information, buses, cars and trains can move efficiently. For example, there are sensors embedded in the road and GPS trackers in taxis. This information helps employees update roadside signs. Seoul smart card counts subway passengers
the Seoul metropolitan government and the road traffic authority are working together to help; smombies' Avoid traffic accidents. Smombie refers to people using smart phones when they are walking. Although the number of road accidents has decreased in the past few years, pedestrian accidents have not changed. The first traffic lights, which are connected to ground signals, were installed this month
3. Intelligent infrastructure
Seoul Metro is using Internet of things technology to repair escalators and prevent any technical problems in advance. Escalators are equipped with sensors to alert authorities in real time in the event of a failure. Then send a repairman immediately. The repair time is reced by half. Transportation companies plan to add safety devices to prevent escalators from reversing, so as to rece the number of accidents
4. Convenient public services
South Korea ranked first in the United Nations e-government survey for three consecutive times. Most public services are now available online
other technologies, such as artificial intelligence, are also used by governments to make their citizens' lives easier. Seoul Incheon Airport (ICN) opened a new terminal 2 in January 2018. In this high-tech terminal, passengers can check in on the machine, and they can put down their luggage by themselves. If passengers need to find their way, robots will help them and even take them to their gates< Tokyo is the first city in the region to adopt green initiatives in 2002, including a series of building rules. It launched the world's first urban cap and trade program for large facilities in 2010. The cap sets emission limits, while trade allows companies to sell and buy environmental credit. This approach will rece greenhouse gas emissions by 20% by 2016
2. Intelligent mobile
the main mode of transportation in Tokyo is public transportation, and the accurate one is the railway system
organizers of the 2020 Tokyo Olympics decided to introce an online system to allow athletes and officials to avoid traffic jams. Their vehicles will be connected to the Internet, and the data will be integrated with separate information on traffic jams and accidents owned by police and road administrators, allowing the system to provide drivers with instructions on the best route. Once the games are over, organizers hope to turn the technology into a system to ensure the effective movement of emergency vehicles in the event of disasters
Japan also plans to install autopilot on its own road. 356; His government plans to start testing autonomous car systems on public roads this year with the goal of launching self driving services for the 2020 Tokyo Olympics. Nissan is currently testing easy ride, which will allow users to book semi-automatic rides using the app
3. Intelligent infrastructure
Yamanote Line is a loop line around the center of Tokyo and the largest transportation infrastructure in the world. It is used by 34 million passengers every week. Supported by Internet of things and sensor technology, it collects and analyzes train and railway data in real time, making it possible to detect small changes and predict faults in advance
4. Inclusion of the elderly
Japan has always been one of the most innovative countries in terms of the rapid aging of artificial intelligence and robot technology. The state estimates that the number of dementia patients will increase to 7 million by 2025, and expects a shortage of nursing staff
advanced care institutions are testing robots that provide social and physical health care. A nationwide survey found that 80% of respondents over the age of 40 welcome or are willing to accept the help of nursing robots. Research shows that through robot care, the elderly's autonomy, sociality, emotional and communication skills are improved, and the quality of life is also improved. The technology has been supported by the government since 2013
5. Safety
according to the economist's latest report on urban safety, Tokyo is the safest city in the world. The government has done a good job in protecting the infrastructure for the coming Olympic and Paralympic Games. They also focus on digital security and health safety, and are at the top of both categories< 4. Wuxi, China
1. Energy consumption
Wuxi New Area is China's Internet of things and sensor technology center. Wuxi has more than 2000 Internet of things companies and 150000 employees. Wuxi has formed a complete instrial chain, from sensor and network communication to processing application and basic research< At the same time, Wuxi Municipal government formulated a low-carbon urban planning in 2010. As a result, some of the companies set up in the city are working to improve energy efficiency through the Internet of things
2. Intelligent mobility
the city's position as a leader in the Internet of things makes it an ideal place to test pilots in the field of intelligent mobility
Wuxi is experimenting with open instry platforms for intelligent traffic management on some major expressways, with partners including Audi, an automobile manufacturer, and Huawei, an electronics company. The technology, called "vehicle traffic" (v2x), connects the city's traffic light network to cars to help ease traffic flow, allowing the light to be adjusted to the maximum number of vehicles that want to travel in a particular direction
in 2014, the city has also become a pioneer in the application of electronic vehicle identification, which has been deployed nationwide. License plate information, such as license number, is stored on an RFID tag attached to the windshield. People can check their position in a real tile through a smartphone app. Compliance will be implemented voluntarily this year, but will be mandatory for new vehicles in early 2019. Authorities have described the plan as a means of improving public safety and alleviating worsening traffic congestion
it is also the first city to test Didi's new on-demand meal delivery service in April this year
3. Security
in September last year, Tencent established the Internet of things laboratory in Wuxi New Area. The Chinese giant is working with Intel to develop a secure blockchain system for the Internet of things to help protect personal privacy and the development of smart cities
4. Convenient public services
a hospital in Wuxi was approved to launch the national e-medical card project as a model hospital in September 2017 before it was officially launched in December 2017. Citizens can apply for a private QR code in the app or wechat, and use it in any hospital in the country to register, receive treatment, pay and get drugs. The national electronic medical card can also automatically collect and save medical and image data of patients to form personal electronic health records< 5. Yinchuan, China
1. Energy consumption
Yinchuan firmly supports the use of renewable energy. The whole city is equipped with public stbins and can be used as compactors because their capacity can be increased fivefold. Another feature is that when the garbage collector is full, the garbage can will send a signal to the garbage collector, which can better manage the garbage collection
2. Smart mobility
as part of the services provided by the smart city, RFID responders are distributed to residents to manage traffic effectively. More than half of private vehicles are equipped with such sensors, so they can be tracked
in addition, the first driverless monorail line was implemented in Yinchuan. This rail transit alternative operates on a single track and offers multiple benefits: low capital cost, short construction time, low noise, low cost
3. Safety
Yinchuan is a city that mainly uses facial recognition. Facial recognition security at the door means keyless access to your apartment. stay
6. Network collection, not original< Download irshell3.8

3.81 download address: http://www.cngba.com/thread-17118783-1-1.html [neocore] group update

2. Decompress,
put the compressed package file into MSP MS0, and the irshell folder is in the root directory

3. Run irshell on PSP
if you need to start irshell automatically, Please irsautoboot.prx to seplugins, add MS0 / seplugins / recovery.prx line to vsh.txt, and finally set irsautoboot.prx to open in recovery mode

4. Patch
we take small P with firmware version 3.71 as an example, find MS0 / irshell / patch / 3.71 directory in directory view, and run & quot; btcnfpatch.prx"( Different versions, please select the corresponding patch)
there is a TXT file run xxx.xxx under FW? In the folder??? IR shell. TXT
under the explanation of??? The core irshell runs xxx.xxx file (patch file)
for example, users of 3.52m33 need to run 1.50 core irshell first, and then run 3.5x & # 92; Then in the interface that appears, continue to click x
to say that the black screen will be patched, Please close all plug-ins

5. Set the video output
A. click the settings Icon

B. find the options

C. save

to output the video

6. Delete the irshell folder in the root directory of MS0
delete MS0: &# 92; PSP\ Irshell2x3x folder under game
delete MS0: &# 92; PSP\ Irshell150 and irshell150% folder under GAME150
delete MS0: &# 92; Remove the MS0 / seplugins / irsautoboot.prx line in vsh.txt file
usage
basic operation, press X to enter and select exit/_&# 92; Is menu

we will explain some common functions in depth

the first line

1. Directory view
after entering irshell, such an interface will appear by default, which can be divided into six lines with six icons in each line. Next, I'll explain from left to right what each icon does. You can see the file browser even if you don't understand any English. JPG (62.05 KB)
2007-11-22 20:48

after clicking x, you can see this interface, This is the file in your memory stick
directory view.jpg (51.34 KB)
2007-11-22 20:48

you can run ISO, self-made programs, songs, MP4, PMP and other files here. As long as you find the file and click x, you can view and run it

specially explain the operation of self-made programs
we take the GBA simulator of gpsp as an example, and I put this self-made program in J: &# 92; PSP\ GAME371\ gpSP_ Kai3.2-7 in the
homemade program. JPG (63.61 KB)
2007-11-22 20:48

point x can run

2. MS0 / PSP / photo: image browsing, the path can be changed in the settings, such as MS0 / picture We will explain the corresponding settings in the setting options)
3. MP3 view: directly enter the directory of MP3 files, press the circle to select multiple files / folders, and press the fork to play
4. Application view: homemade software, because most of them are in game371, so make sure that the settings are also set to MS0 / PSP / game371 (we will explain the corresponding settings in the setting options)
5. IR remote view: infrared remote control, the default band can only correspond to some remote control appliances (slim P, please retreat)
6. Game save view: archive manager, You can view the archive information or backup / delete the archive

the second line

1. Read the content on the UMD disk
2. Prefixed homebrew
the predefined self-made software is similar to the shortcut on the computer desktop, there are five in total, and the first one is the network browser by default. The latter four can be defined as commonly used homemade software

the required self-made software to MS0: &# 92; IRSHELL\ The corresponding folder in homebrew3x can be
rdown corresponding to R + Remote rod, rleft corresponding to R + Remote rod, left Rright corresponding to R + Remote rod, right RUP corresponding to R + Remote rod,

the third line
1. Toggle USB mass storage
connected to USB for file transfer, USB connection similar to XMB

2. Toggle usbhost maps a folder in the hard disk to usbhost0: /, which can be used to play games on the hard disk It needs the cooperation of remotejoy4irs, please refer to here for this software application)
this function is the most powerful function of ishell, which is to read the games on the hard disk and PMP files
A. open usbhost function
usbhost.jpg (63.8 KB)
2007-11-22 21:19

B. enter directory view and open here, You can see the directory of your hard disk
usbhost1.jpg (51.34 KB)
2007-11-22 21:19

usbhost2.jpg (45.24 KB)
2007-11-22 21:19

(if you open the mapping of all hard disks in remotejoy4irs, it should be like this)

C. find your favorite game, Click x to run
usbhost3.jpg (47.43 KB)
2007-11-22 21:19

3. Toggle usbhost redirection
map a folder on the hard disk to MS0: /, and the content of the memory stick to MS1: /, In fact, it's similar to toggle usbhost. 4. Toggle nethost:
maps a folder in the hard disk to nethost0: /. The method is the same as toggle usbhost, except that it enters the hard disk in nethost0: /

5. Toggle nethost redirection
maps a folder in the hard disk to MS0: /, and the content of the memory stick becomes MS1: /

6. Initiate ad hoc WiFi transfer
wireless file transfer, which can transfer any file in the memory stick, which can be used to exchange ISO files<

the fourth line
mp3 play / pause: MP3 play / pause
stop Mp3: stop playing
previous track: Previous
next track: next
mp3 volume down: decrease volume
mp3 volume up: increase volume
multiple mp3 can be played through file browsing or MP3 View icon, circle to select file / folder, cross to play

the fifth line
1. File management
file management: select a file / folder ring file browsing, return to the main interface, and then enter file management to rename, delete, and the selected file / folder
for example, I want to delete the blackspeed.log.txt file in MS0
first enter the directory view, move the cursor to blackspeed.log.txt, press Select to exit
1.jpg (56.51 KB)
2007-11-22 21:48

and then click the file management icon (or L +], The following interface will be displayed to operate the file
2.jpg (43.17 KB)
2007-11-22 21:48

suppose you press the [] key, the following screen will be displayed for you to confirm
3.jpg (42.68 KB)
2007-11-22 21:48

make dir input method question
the rocker controls the grid where the cursor is located, and then the cross corner block corresponds to four characters in each grid. Press and hold R is uppercase, then press L is uppercase, lowercase, symbol switch at the same time. Direction key is to delete, space is to move the cursor left and right, select key to cancel, start to confirm<

2. Launch devhook
Run DH (I haven't used it before, so I don't know about it)

3. Launch XMB
Enter XMB interface

4. Set alarm clock
set alarm clock

5. Toggle CPU speed
adjust CPU frequency, click and change it once, From 100 to 333
cpu.jpg (61.49 KB)
2007-11-22 22:09

6. Lock irshell
there is no password by default
lock.jpg (52.55 KB)
2007-11-22 22:09

input method problem
the rocker controls the grid where the cursor is located, and then the cross corner corresponds to four characters in each grid. Press and hold R is uppercase, then press L is uppercase, lowercase, symbol switch at the same time. Direction key is to delete, space is to move the cursor left and right, select key to cancel, start to confirm

line 6
1. Reset irshell
X: irshell restart
O: machine auto restart
[]: irshell exchange of 3xx kernel and 150 kernel
/_&# 92;: Cancel operation

2. Exit irshell
X: exit to XMB
O: enter sleep mode
]: shut down completely (same as pushing up the switch for 3 seconds)
/_&# 92;: Cancel operation

3. Irshell configurator
system settings

4. System info

system information

from top to bottom:
battery
power
battery status
battery temperature
battery voltage

free memory
kernel memory
user memory
VSH memory
Part5 memory I don't know what it is)

5. Help
help information, introce shortcut keys

basic keys

combination keys of L

combination keys of R


6. Mute game audio

when playing MP3, close the corresponding channel.
Troubleshooting:
1, But when all the three files are running, why is the black screen?
A: turn off all your plug-ins, first run 1.50 core irshell, and then run 3.5x & # 92; The eboot.pbp file under btcnfpatch

2. Does it support PSP2000
A: the author said that I support it. I don't have PSP2000... I can't test it.

3. Can I do a tutorial for video output
A: because the video output is similar to 3.7, and Jiangnan Sisi has done a good tutorial
please refer to http://www.cngba.com/thread-17026267-1-1.html

3. Why can't my PSP2000 run 150 core irshell
A: PSP2000 doesn't support 150 core irshell, please delete PSP & # 92; GAME150 folder

4. What's wrong with broken icons
A: please use__ SCE__ And%__ SCE__ To hide the files in the damaged GAME150

5. About the PC keyboard and handle mapping function (turn to Jiangnan 44)
A: after testing, you can play PSP games with the computer keyboard and handle at the same time. First, install the handle correctly in the system (the Logitech al action handle I use is free of
driver, and the system can automatically identify it), then open the keyboard and handle mapping function in irshell to control the PSP. It's just that there are differences in key positions, which should be adapted to
. Irshell can be set according to the following figure:

at present, this version does not provide the option of Custom PC handle key
but I put it in 92; RemoteJoy4iRS\ MS_ ROOT\ Joy in the directory_ 1. The map file is opened with a text editor and can be modified. Different brands and models of PC
handle keys are different, so you can try to modify them yourself if you are interested

the mapped keys of PC keyboard are as follows:

6. About the application of irshell file association
this is similar to the file association of windows system. For example, if your computer has office 2003 installed, you double-click the *. Doc file, Word 2003 will run automatically
suffix.jpg (113.1 KB)
2007-11-23 12:36

here we take the PPA of 3xx kernel as an example to explain
ppa.jpg (101.24 KB)
2007-11-23 12:36

we can see the files with AVC and PMP suffixes. After clicking, they all call app: 2
app: 2, which means MS0: &# 92; IRSHELL
7. Digging money is very harmful to computers. It's always full load, less than a few. It's only enough for electricity bills. If you really want to dig money, you have to invest in graphics cards or mining machines,
8. digital currency is abbreviated as digicicy, which is the abbreviation of "digital currency". There are many kinds of digital currency. From the initial bitcoin, France to various cities, digital currency is complex and diverse, such as: Leyte coin, doggy coin, Yuanbao coin and so on. If you want to know more about it, you can go to btc100. There are many kinds of digital currencies.
9. Don't believe it. I bought it three days ago. Except that the first day showed a computing power, the second day didn't show it, the third day didn't show it, and there was no profit. There was no customer service, just a wechat, and there was no money in the garbage pit. It was far worse than absenteeism
10.

Safety has always been the most important issue in mining instry, especially for underground mining. Although modern mining instry is safer than decades ago, accidents often occur
mine ventilation is the key to ensure the safety of miners. Poor ventilation will lead to silicosis. Especially in coal mines, it will cause gas (methane) accumulation and explosion. The ventilation system is completed by the powerful exhaust fan, which makes the mine reach the negative pressure, and the fresh air will be imported into the mine by other pipes, so as to achieve good air circulation. The mineral resources law, revised in 1996, has made important amendments and improvements to China's legal system of mining rights, established a system of paid acquisition and legal transfer of exploration and mining rights, which is suitable for the socialist market economic system and in line with international practices, and clarified the legal status of foreign investment in exploration and mining of mineral resources. In February 1998, the State Council promulgated three administrative regulations, namely, the administrative measures for the registration of mineral resources exploration blocks, the administrative measures for the registration of mineral resources exploitation, and the administrative measures for the transfer of exploration right and mining right, which further specified the system of exploration right and mining right, and determined that under normal circumstances, foreign investors or Sino foreign joint ventures, mining right transfer, etc A contractual joint venture may directly apply for the right to explore and develop mineral resources. It shows that in the field of mineral resources exploration, development and opening to the outside world, foreign-invested enterprises and domestic enterprises enjoy equal national treatment
in 2000, the Ministry of land and resources issued the notice on issues related to the application for exploration rights by foreign-related unincorporated enterprises, which clearly stipulates that all foreign-related joint ventures, cooperative companies, offices and representative offices that are officially registered in China's instrial and commercial administration authorities and obtain business licenses for unincorporated enterprises can refer to the applicants with legal personality, The application for mineral exploration right and geological exploration unit qualification in accordance with the law shall go through the examination and approval proceres at the Ministry of land and resources, and be included in the unified management of geological exploration unit qualification nationwide. Subsequently, the Ministry of land and resources and the Ministry of Finance issued the notice on printing and distributing the methods for recing and exempting the use fees of exploration and mining rights, and formulated certain preferential policies< In December 1999, the Ministry of Finance promulgated the regulations on accounting treatment of exploration right and mining right of enterprises and the regulations on accounting treatment of exploration right and mining right of geological exploration units to clarify the entry cost of exploration expenses< On September 28, 2000, the Ministry of land and resources, the State Planning Commission, the State Economic and Trade Commission, the Ministry of finance, the Ministry of foreign trade and economic cooperation, and the State Administration for Instry and Commerce jointly formulated and promulgated several opinions on Further Encouraging Foreign Investment in exploration and exploitation of non oil and gas mineral resources. Foreign companies and their offices and representative offices established in China are allowed to conct risk exploration of non oil and gas mineral resources in the form of sole proprietorship or cooperation with China; The preferential policies for foreign investors to explore and exploit non oil and gas mineral resources are clearly stipulated; Special encouragement will be given to foreign investors in the exploration and exploitation of non oil and gas mineral resources in the western region
the main problems existing in China's current non-ferrous mining policy are as follows:
first, insufficient support and narrow financing channels
after the "transfer of funds to loans", nonferrous mining enterprises are short of funds, the burden of interest is heavier, and the financing channels are narrow. On the one hand, commercial banks and other financial institutions are reluctant to invest in mining instry e to the risk and low profit of the mine; On the other hand, e to the influence of investment environment and mining policy, the domestic and foreign financing channels of China's nonferrous mining instry are not smooth. As a result of these factors, some mines with better resource conditions can not be developed in time e to financial problems
secondly, there are many kinds of taxes and heavy taxes
VAT. After the tax system reform in 1994, although the value-added tax of nonferrous mining enterprises was adjusted to 13% in May of that year, compared with the previous tax rate of the same caliber, the mine tax still increased significantly
resource tax and resource compensation. Since the introction of resource tax on January 1, 1994, the proction cost of mining enterprises has increased significantly. In addition, the resource compensation fee will be levied from April 1, 1994. It is unreasonable to levy both resource tax and resource compensation fee. Moreover, the resource compensation fee of mining and metallurgy enterprises is much higher than that of single mining enterprises, which makes the tax of mining and metallurgy enterprises "worse"
thirdly, the implementation of overseas development policies is not in place
although the State encourages and supports the development of domestic shortage of copper, nickel, gold, silver and other mineral resources abroad, the actual implementation process is not satisfactory. For example, chambisi copper mine in Zambia is a cooperative project determined by Premier Zhu Rongji when he visited Zambia in 1995, and it is also the first copper mine independently developed by China abroad. In July 1998, China Construction Group signed agreements with Zambia on the purchase of 85% equity of Chambishi Copper Mine and mine development. Due to the implementation of funds and other issues, the current development and proction of the copper mine has encountered difficulties. In recent years, underground mining technology has developed rapidly at home and abroad, and many new mining technologies, new processes, new materials and new equipment have been applied in underground mines. Some domestic mines and a number of advanced mining technology and equipment have stepped into the ranks of the world's advanced level. The development of mining technology and equipment in underground metal mines at home and abroad is mainly reflected in the great changes in the proportion of various mining methods, mining technology and technical equipment, which are developed along the direction of high efficiency, high recovery rate and mechanization. The stope proction capacity and labor proctivity have been greatly improved, and the loss and dilution index have been greatly reced. At present, the main mining methods are filling mining method, open stoping mining method and caving mining method. According to the statistics of 18 key iron mines, caving method accounts for 94.1% and open stoping method accounts for 5.9%. In gold mines, filling method accounts for 31%, open stoping method 65% and others 4%. In nonferrous metal mines, open stoping accounted for 46.1%, filling 19.6% and caving 34.3%. From the above statistical data, the underground mining of iron ore is still dominated by caving mining method, while the underground mining of non-ferrous and gold mines is still dominated by open stoping and filling mining method. In the past ten years, the filling mining method and filling technology of underground metal mines have developed rapidly, and the caving mining method and open stope mining method are constantly improved and innovated. Therefore, it promotes the rapid development of underground mining technology of metal mines in China, and makes the technology of some mines reach the international advanced level

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