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A large stope in the Treadwell gold mine, Alaska 1908; an example of shrinkage stoping. Shrinkage stoping is most suitable for steeply dipping ore bodies (70°—90°). In shrinkage stoping, mining proceeds from the bottom upwards, in horizontal slices (similar to cut and fill mining), with the broken ore being left in place for miners to work ...
Shrinkage stoping is a short-hole mining method which is suitable for steeply dipping orebodies. This method is similar to cut and fill mining with the exception that after being blasted, broken ore is left in the stope where it is used to support the surrounding rock and as a platform from which to work.
Here are some of the most commonly used depreciation methods: ... For example, if you purchase a rental property for $500,000, you can depreciate the cost of the physical property. If the value of ...
An asset depreciation at 15% per year over 20 years [1] In accountancy, depreciation refers to two aspects of the same concept: first, an actual reduction in the fair value of an asset, such as the decrease in value of factory equipment each year as it is used and wears, and second, the allocation in accounting statements of the original cost of the assets to periods in which the assets are ...
Stoping is a process accommodating the ascent of magmatic bodies from their sources in the mantle or lower crust to the surface. The theory was independently developed by Canadian geologist Reginald Aldworth Daly [ 1 ] and American geologist Joseph Barrell .
More modern room and pillar mines use a more "continuous" method, that uses machinery to simultaneously grind off rock and move it to the surface. [12] Other processes, such as backfill, where discarded tailings are unloaded into mined-out areas, [9] can be used, but are not required. Retreat mining (below) is an example of a process like this.
Depletion is an accounting and tax concept used most often in the mining, timber, and petroleum industries. It is similar to depreciation in that it is a cost recovery system for accounting and tax reporting: "The depletion deduction" allows an owner or operator to account for the reduction of a product's reserves.
The increase in depreciation arising out of revaluation of fixed assets is debited to revaluation reserve and the normal depreciation to Profit and Loss account. Selection of the most suitable method of revaluation is extremely important. The most used method is the appraisal method.