May 24, 2019· This method to calculate depletion expense is similar to the units of production method of depreciation. However, if a company does not sell all of the resource extracted in a given period, the calculation process needs to be modified so as to record any unsold amount as inventory and not as depletion expense.
Applications of Queuing Theory for Open-Pit Truck/Shovel Haulage Systems Meredith Augusta May Abstract Surface mining is the most common mining method worldwide, and open pit mining accounts for more than 60% of all surface output. Haulage costs account for as much as 60% of the total
Pillar Strength and Design Methodology for Stone Mines Gabriel S. Esterhuizen, Sr. Research Engineer Dennis R. Dolinar, Lead Research Engineer John L. Ellenberger, Lead Research Scientist NIOSH-Pittsburgh Research Laboratory Pittsburgh, PA ABSTRACT Underground stone mines in the United States make use of the room-and-pillar method of mining.
length along exploration or mining works, the tonnage-cutoff and average grade-cutoff models are constructed, which are applicable in both exploration and operating mine environments. Via these models, the relationships between ore tonnage, metal tonnage and cutoff are obtained in terms of the fractal model of element concentrations.
Calculation of Ore Tonnage & Grade from Drill hole Samples. The increase in the tonnage of copper by the Harding angular method proved to be more than 54,000 metric tons, and the percentage of copper per ton was also increased by 0.024 per cent.
THE IMPORTANCE OF DILUTION FACTOR FOR OPEN PIT MINING PROJECTS* Anoush Ebrahimi, P. Eng., Ph.D. ... Financial models calculate revenues by using tonnage and grade of ore which is determined ... Factors that are related to mine operation comprise the mining method, mine geometry, mining .
Coal mining - Choosing a mining method: The various methods of mining a coal seam can be classified under two headings, surface mining and underground mining. Surface and underground coal mining are broad activities that incorporate numerous variations in equipment and methods, and the choice of which method to use in extracting a coal seam depends on many technological, economic, …
Estimates of the tonnage and average grade of ore deposits (ore-reserve estimates) are made for various purposes. They may be made by examining engineers as a basis for placing a value on a mining property in connection with reports on behalf of owners or vendors, on the one hand, or for prospective purchasers or lessees, on the other.
taken during the mining cycle. This 'ras comlnred to the esti'rnated tonnage predicted by the three methods, again using drill hole data available prior 1985 CIM SltmPosium Ore reserve estimati-on: methods, models and realitY. H. G. SHERWOOD Technical- University Nova Seotia to mining and then all available drill hole data.
Calculation of Ore Tonnage & Grade from Drill hole Samples. Mar 19, 2017 The area of each prism, which is given in the figure, was calculated by the method just outlined and the results of the calculation of tonnage and grade of the ore content are shown in .
Volume calculations are very important in mining to not only estimate the efficiency of machines and mining methods, but also to determine how much contractors should be paid if they are paid on a material-moved basis.
2011 Underground Coal Operators' Conference The AusIMM Illawarra Branch 10 – 11 February 2011 83 CALCULATION OF SUBSIDENCE FOR ROOM AND PILLAR AND LONGWALL PANELS Anton Sroka1,2, Krzysztof Tajdus2 and Axel Preusse3 ABSTRACT: A European method of surface subsidence calculation for partial room and pillar and longwall panel mining of coal deposit is presented.
Before you can calculate the potential mineral deposit value, you first need to gather some specific data regarding the ore body and the individual drill results.. This required data can be found in the mining company's press releases in which they announce their drill results.Make sure that this data is announced according to the guidelines of National Instrument 43-101 (i.e. approved by a ...
Increasing Production Time in Continuous Mining Methods EE Dorey D McGinness SYNOPSIS The use of continuous miners in a conventional bord and pillar section results in a considerable amount of unproductive time. This is due to the roof support requirements, continuous miner configurations, and shuttle car 'change-outs'. These factors have
Room and pillar (variant of breast stoping), is a mining system in which the mined material is extracted across a horizontal plane, creating horizontal arrays of rooms and pillars. To do this, "rooms" of ore are dug out while "pillars" of untouched material are left to support the roof overburden.Calculating the size, shape, and position of pillars is a complicated procedure, and is an area of ...
Each of the models is developed from first principles based on typical mining criteria for rock densities, swell factors, drill penetration rates, etc. Industry-standard estimating methods are used for equipment selection, personnel allocation, and cost estimation. These models are invaluable for early order- of-magnitude estimates.
Resource estimation is used to determine and define the ore tonnage and grade of a geological deposit, from the developed block model. There are different estimation methods (see below) used for different scenarios dependent upon the ore boundaries, geological deposit geometry, grade variability and the amount of time and money available.
Mining this narrow style of mineralization can be considered as relatively high risk, not only due to the high cost of exploration and mining per unit of metal, but also to the frequently limited size of the resource. Estimation of the Mineral Resources and their location can be difficult.
This chapter explains the different ways the weight of waste or diverted material can be measured or calculated. Note that the volumetric and per capita methods may only be used by facilities approved to submit annual returns. Methods applicable to all disposal facilities Why do I need to specify how I will calculate tonnages? The levy is calculated on the net tonnage of
Reporting Coal Tonnage Sold for Export. All coal operators must report tonnage sold for export and pay the related coal reclamation fees, in accordance with the Surface Mining Control and Reclamation Act as amended.. Certain coal operators have claimed in recent litigation that the reclamation fee is unconstitutional as applied to coal that is exported.
The results of carrying out this method through a complete orebody of a large tonnage seem to justify the labor involved therein—the tonnage checks with the standard method to within 1.014 per cent.—the standard method showed about 55,000 metric tons less copper and the percentage, by the standard method, was about 0.0242 per cent. less.
In the English system, the tonnage factor is normally expressed as cubic feet per ton of ore. In the metric system, the tonnage factor is the specific gravity of the ore. Probably the most accurate method of determining specific gravity of an ore is to calculate an average specific
CHAPTER 11 Mining Technology The Federal Coal Leasing Amendments Act of 1976 charged OTA to assess the feasibility of the use of deep-mining technology on leased areas. With the passage of the Sur-face Mining Control and Reclamation Act of 1977 congressional interest in the study of deep underground mining technology shifted
CHAPTER 8 Stripping Ratios, Pit Limits & Cutoff Grade Optimization Dr. Teuku Andika R Putra USM 2014 Stripping Ratios The stripping ratio (SR) refers to the amount of waste that must be removed for a given quantity of ore in open pit mining.
The issue of balancing dilution and ore recovery is a challenging one as profitability is to be optimized while not effecting the efficiency of operation. It has been noted that instead of utilizing labour intensive mining methods to high tonnage bulk mining has decreased the ability to control ore recovery.
For conducting a mining project's break even analysis, you first need to know about the operational expenses (OPEX).When the OPEX is known, you can calculate the mineral's cut off grade, which is the break even grade, below which it is not economically viable to mine the ore.To find out how I come up with the cost price per tonne (OPEX) if a feasibility study isn't available, I refer you ...
methods of calculating tonnage in mining. Calculation of Ore Tonnage & Grade from Drill hole Samples. ... WEBSITEARTICLESGuide to Tonnage. tonnage calculation methods developed a century ago, U.S. vessels can optionally be measured under …
BREAK-EVEN ANALYSIS OF MINING PROJECT ... 2.3 Surface vs. underground mining costs 5 2.3.1 Mining method costs 6 2.4 Budgeting and cost control 8 ... viable ore is also dependent on the assumptions used for its calculation and can change with a change in assumptions.
Nov 23, 2003· anticipated mining and grade control methods and size and type of equipment. In block modeling, the size of the blocks in the model will be chosen to best match mining selectivity and the anticipated grade control method, sample density and sample statistics. In the case of computer based modeling, the QP responsible
methods of calculating tonnage in mining « equipment for quarry. Grade and Tonnage for British Columbia Mineral Deposit Models The use of the compiled grade and tonnage data forms the basis for quantifying the …
How to calculate grade and recovery concentrate? ... Refers to the average per ton of gold content in concentrate, it is a reflection of the concentrate quality index, the formula for calculating: ... Refers to the final product quality was obtained by various processing ore dressing method of the percentage of gold content. According to the ...
In mining, stripping ratio or strip ratio refers to the ratio of the volume of overburden (or waste material) required to be handled in order to extract some tonnage of ore. For example, a 3:1 stripping ratio means that mining one tonne of ore will require mining three tonnes of waste rock.