design of rock passes in gold mines


Design in Weak Rock Masses: Nevada Underground Mining ...

Underground mining methods as practiced in Nevada dictated which specific databases and stope design curves NIOSH would focus upon. Rock mass values were calculated during mine visits and varied from an RMR high of 70% and a low of 16% in gold-bearing fault gouge. Several rock mass design curves developed by the rock

Get More

Grab sampling for underground gold J mine grade control

Opemiska mine (Quebec, Canada), narrow gold sulphide veins were exploited; mining was undertaken with either shrinkage or longhole stoping. In the longhole stopes, a wall dilution of 35% to 40% was added to the ore. As the walls are massive and mostly barren, they contributed large fragments that required removal to the waste pass. The

Get More

Optimizing the life of ore passes in a deep-level gold mine

Investigations of damaged ore passes at Moab Khotsong and surrounding mines revealed some interesting mechanisms of damage, and some innovative methods of reducing or eliminating the damage have been implemented at Moab Khotsong. The system design was based on 30 years, experience in main shaft rock passes. The design was to counteract scaling ...

Get More

SUPPORT IN UNDERGROUND HARD ROCK MINES

waste passes. The progressive wear of the exposed cable does not reduce the support provided by the remaining length of grouted cable. The flexibility of the cables allows the rock mass to 'work' without a significant loss of strength. In cut and fill mining, long grouted cables can be …

Get More

The absence of strategy in orepass planning, design and ...

In a study of more than 200 individual passes in South African deep level gold mines, i.e. more than 2,000 m, it was observed that more than 50% of the passes had stability problems, and 16% had been abandoned (Joughin and Stacey, 2005a, 2005b). The severity of the pass problem at deeper levels was

Get More

(PDF) Design of grade control sampling programs for ...

Design of grade control sampling programs for underground gold mines. January 2011; Authors: Simon Dominy ... All samples should pass or the entire batch should be reground. ... (e.g. barren rock ...

Get More

Mining Contract: Weak Rock Mass in Nevada Gold Mines ...

Mining Contract: Weak Rock Mass in Nevada Gold Mines: Behavior, Support Design, and Performance. Keywords: Nevada Support design and selection Weak rock. This page is archived for historical purposes and is no longer …

Get More

Deep Mining: A Rock Engineering Challenge | SpringerLink

Increasing demand for metals caused by global economic growth and exploitation of shallow mineral deposits forces mineral extraction to go deeper. A direct consequence of this development is an increase in rock pressure-related mining problems. The role of rock engineering in the design and operation of deep mines is discussed in detail. Critical issues are the rock fracturing around mining ...

Get More

Placer Gold Mining Methods

placer mining equipment. How to Recover Gold from Placers in Mining. The gravel obtained from any placer deposit is, with exceptions, ultimately all treated alike, but the mode of winning the dirt varies with the necessities of the case. On flats and bars, the surface gravel, if rich enough, is loosened with pick and shovel, and then washed.

Get More

Gold Mine Images | Free Vectors, Stock Photos & PSD

50. Secs. left! Go Premium. Treasure cave with golden coins in chest and wooden barrel, crystal gems, crown, sword in pile of gold and goblet with precious rocks, ancient fantasy magic tomb or mine, cartoon vector illustration. upklyak. 2k 164. Like. Collect.

Get More

Newmont Goldcorp MINE UNDERGROUND OPERATIONS …

Lake mines began operations in 1949 and produced 23.6 million ounces to Dec. 2018. The Cochenour-Willans mine was in operation from 1929-1971 and produced 1.2 million ounces of gold. Mining Methods: Figure 1 - #3 Shaft Headframe Balmer Complex Figure 2 - Reid Headframe Campbell Complex Figure 3 - Cochenour Headframe Cochenour Complex

Get More

Detailed Tour Of A Small Gold Mine - YouTube

Owner of a private cut and fill gold mine gives us a detailed tour, demonstrates tools, equipment, construction and the geology of his mine. Some of the clip...

Get More

Underground hard-rock mining - Wikipedia

Underground hard-rock mining refers to various underground mining techniques used to excavate "hard" minerals, usually those containing metals, such as ore containing gold, silver, iron, copper, zinc, nickel, tin, and lead.It also involves the same techniques used to excavate ores of gems, such as diamonds and rubies. Soft-rock mining refers to the excavation of softer minerals, such as salt ...

Get More

Maine Geological Survey: Gold in Maine

There are no active gold mines in the state at the present time, but some old gold mines are listed in a two-volume series entitled "Maine Mines and Minerals", by Philip Morrill and William Hinckley, which may be available in Maine mineral shops or local libraries.

Get More

Risks associated with rockpasses in deep-level tabular ...

deep-level tabular mines based on historical pass performance by W.C. Joughin* and T.R. Stacey† Synopsis Problems with the stability and performance of rockpasses in deep-level mines are common. This paper presents the results of an investigation into the recorded performance of rockpasses in deep-level gold mines.

Get More