Underground mining

1. Digger, it should be this. Please accept if you are satisfied

2. We can dig out fragments of various colors, fossils of different generations, 16 kinds of stone slabs, various kinds of jade (in the underground world,
exchanging things with Shannan), scales of the soul,
changing stones,
, black iron balls, clay of light, precious bones, moist rocks, hot rocks, gravel rocks, various evolution stones, Xingsha, Yuanqi tablets, Yuanqi fragments, and important stones.

3. I've used it. It's OK. It has many functions. It's convenient.

4. It is called pit mining for short. The general term for mining with underground tunnels. Generally, it is suitable for deep buried ore bodies, which are not suitable for open-pit mining economically and technically. The ore body is divided into mine field, stage and ore block (or mining area) by underground roadway engineering, and the ore block is taken as the basic mining unit for mining.

5.

1. Different properties: open pit mining, also known as open pit mining, is the process of removing the covering on the ore body to obtain the required minerals and extracting useful minerals from the open surface stope. Underground mining refers to the process of extracting ore from the ore block of underground deposit

The open-pit mining operation mainly includes perforation, blasting, mining and loading, transportation and mping. According to the continuity of operation, it can be divided into discontinuous, continuous and semi continuous. Underground mining is realized by four steps: deposit development, ore block preparation, cutting and stoping

The main technologies of open-pit mining are as follows: see open-pit mining boundary; Slope stability of open pit mine; Mining technology; Mining proceres; Open pit mine development; Dry drainage; Mine environmental protection, mine land reuse; Open pit proction scheling. There are many kinds of underground mining methods. Based on the ground pressure management method, the commonly used underground mining methods are divided into three categories: natural support mining method, artificial support mining method and caving mining method

extended data :

characteristics

mines that convert open pit mining to underground mining are usually steeply inclined deposits with deep ore body extension, low overburden and medium thick or large thickness, In the early stage, open-pit mining was generally used, but when the open-pit mining continued to deepen, these mines graally transited from open-pit mining to underground mining, and finally turned to underground mining

Therefore, when designing the transition from open-pit to underground mining, it is necessary to make a unified and comprehensive plan for the mining in the previous and future stages

The development system in the later stage of open-pit mining should not only consider the utilization of underground roadways, but also make full use of the relevant engineering and facilities of open-pit mining to make the smooth transition from open-pit mining to underground mining and keep the mine output and economic benefits stable

6. This is really true. It was proced by Japan's Kobe Steel. I am a member of the company.

in 1905, Kobe Steel Co., Ltd. was founded
in 1930, the first construction machinery in Japan was proced: 50K electric mining single bucket excavator< In 1936, we began to proce 30K electric dragline excavators< In 1946, the steam type single bucket excavator was proced
mechanical excavators (northwest type) were proced in 1947< In 1949, we began to proce 15K diesel engine driven dragline excavators< In 1952, we began to proce single bucket excavator driven by 22K diesel engine
the proction of 10kt and 20kt tyred cranes started in 1953< In 1954, the 220a diesel driven pile driver was proced
in 1955, through an agreement with harnischfeger, the crane proction technology was obtained< In 1956, we began to proce 255a diesel engine driven single bucket excavator and 355kd bucket dredger< In 1957, 255tc tyre crane and 255a-cl crawler crane were proced
in 1960, the 2000th single bucket excavator came off the proction line
proction of 335g, 655g and 955g grab mining dredgers and LA22 pile drivers started< In 1962, we signed a technical agreement with POCLAIN, a French manufacturer
set up the Construction Machinery Research Institute of Shengang in Dawa plant< The first hydraulic wheel excavator ty45 was proced in 1963
start proction of 155b-tc tire crane
in 1964, we began to proce 300 series tire cranes< In 1966, 325 crawler cranes were proced< In 1967, h208 hydraulic excavator was proced
start proction of kg60b, kg80b and kg75b floating crane barges
proction of H212 hydraulic tire crane started< In 1968, the first 10A small hydraulic excavator was proced in Japan
start to proce ys1000 hydraulic excavator with large volume
proction of R series hydraulic excavators started
in 1969, we began to proce T series hydraulic tyred cranes
start proction of R150 cranes adapted to rough terrain
in 1970, he invested in harnischfeger company in Australia
start proction of 670f and 9125f floating crane barges< In 1971, we began to proce K series pile drivers driven by diesel engines< In 1972, ge1500 grab mining barge was proced
LK series tire loaders were proced in 1973
start proction of FD series floating crane barge< In 1977, Mk7 grab dredger was proced
start proction of F & G1000 floating crane barge and grab dredger
start to proce 5000 Series crawler cranes< In 1978, KISCO, a sales subsidiary, was established in Singapore
K series hydraulic excavators were proced in 1979
the last major part of Dawa factory was completed in 1980
established sales subsidiaries in Houston and Texas in 1982
in 1983, we began to manufacture and supply cranes to P & H by OEM
start to proce C series hydraulic excavators
start to proce pk160 and RK200 cranes suitable for rough terrain
start proction of 7450 hydraulic crawler crane
start proction of 5650 crawler crane: lifting capacity 650 tons
in 1985, we began to proce D series hydraulic excavators equipped with kpss 7000 series hydraulic crawler lifting devices< In 1986, Shengang Construction Machinery Co., Ltd. was established
in 1987, Mark II series hydraulic excavators equipped with rotating signal flashlights were proced< In 1988, KCM was established in Calhoun, Georgia, USA
start to proce SK series small excavators (super small)< In 1989, SS1 ultra small excavator was proced
proction of sk100w wheel excavators started
start to proce Mark III series hydraulic excavators equipped with computer-controlled ITCs device
start proction of RK 70m small crane suitable for rough terrain
kcme was established in the Netherlands in 1990
we started to proce ur series hydraulic excavators
start proction of F & g2345 floating crane and grab dredger
in 1991, BM 1200 crawler crane for infrastructure construction was proced
start to proce rk series cranes suitable for rough terrain< In 1992, SK series small excavators were proced< In 1993, Mark IV and Mark V series hydraulic excavators were proced
SL3000 crawler crane proction started: lifting capacity 800 tons< In 1994, ckcm was established in China
the cumulative output of hydraulic excavators reaches 100000 units
proction of 7000 series hydraulic crawler cranes started< In 1995, PK series cranes adapted to rough terrain were proced
two US branches, Kai and KCM, merged to form a new Kai (now kcma)< In 1996, TKCM was established in Thailand to manufacture hydraulic excavators
start proction of SR series small excavators
kcmf was established in 1997< In 1998, SR series hydraulic excavators were proced
start proction of bm700hd crawler crane for infrastructure construction
Yougu heavy instry (Hiroshima factory) and Dawa factory have passed ISO9001 certification< In 1999, the Construction Machinery Department of SG was reorganized into an independent company named as SG Construction Machinery Co., Ltd
start to proce dynamic acera series hydraulic excavators
proction of 7200 crawler cranes started
proction of SR series small excavators started in 2000
start proction of sk80msr hydraulic excavator
signed a global cooperation agreement with CNH global (Netherlands) of Fiat Group in 2001< In 2002, Yougu heavy instry (Hiroshima factory) and Dawa factory passed ISO9001 certification
KCa (Australia) and KCMS (Shanghai) were established to sell construction machinery, and fkcm (Italy) was established to proce and sell hydraulic excavators at the same time
KSCM service center was established in Shanghai in 2003
set up ckcmg holding and sales company in China
http://www.kobelco-jianji.com/aboutus/kcm/history.asp

7. There are 5 miners and 7 choppers. There are many ways for the orcs to play, including pure wolf riding and wind riding. Generally, they have to defend the tower at home and accelerate when they go out. There is also the traditional way of play, you can see more formal competition, master how to play, you will learn a lot, such as the war, to a ground. If the enemy soldiers are always fighting heroes, they can attack their own soldiers and their hatred can be transferred. There is also a good protection of the hero, especially level 3 or above, would rather return, do not sacrifice their hero

8. The underground mine is usually in the mine cave. Look for the hole and go in

9. I g, g out a pile of aphids, emmm should be aphids, I'm Xiao