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Aug 18, 2019· Proceed by determining the surface are of the polygon by using geometric functions of the resulting polygon. The volume is determined by multiplying the surface area with the average depth. Tonnage is then determined by multiplying the volume with the tonnage factor (specific gravity).
Jan 14, 2009· Sampling Calculations Using Gy’s Method References: • Gy, P. M. (1979), Sampling of Particulate Materials: Theory and Practice, Elsevier • Wills, B. A. (1992), Mineral Processing Technology, 5th edition, Pergamon Press, pg. 79 Use: This method is a general-purpose calculation to determine the minimum size of sample needed to
Sand cone method Oil method Balloon method Cylinder method All these except the nuclear method use the fol-lowing procedure: 1. Remove a soil sample from bank state. 2. Determine the volume of the hole. 3. Weigh the soil sample. 4. Calculate the bank density kg/BCM (lb/BCY). The nuclear density moisture gauge is one of the
Before I can calculate the cut off grade, I first need to show a basic equation which converts a troy ounce into grams per ton: 1 troy ounce = 31.1034768 grams per ton = 34.2857143 grams per tonne. As you can see, the difference between a ton and a tonne is approximately 10%. Then, you need to be aware of the following conversions: 1 ton
Capital includes the mining machinery and equipment, plus the processing plant, to produce a finished product. The raw ore is extracted by surface (open pit) or subsurface (underground) mining methods; processed to a marketable state; and delivered to the market. Labor includes all human effort, abilities and skills, Calculating Tons in the
method of mining which is one of the oldest methods of mining. The success of Bord and Pillar mining is selecting the optimum pillar size. If the pillars are too large, then the extraction ratio decreases leading to less profitability and if the pillars are too small it endangers the overall mine safety.
Oct 26, 2017· Ore grade is the single key variable in establishing mine economics. It defines the quality of materials to be extracted and processed. Ore grade defines the state of ore deposit as resources or reserve which further equates to its economic value that can be utilised in mine planning, pit optimisation, production scheduling, setting production target etc.
The capital cost of mining was calculated using the equations below, where D is the daily capacity of the mine in tons of ore produced per day. The constant (i.e., first) term in each calculation is a blanket estimate based on published average initial capital investment in the industry (~USD 500 million for what is defined in this analysis as
Mining Methods 8 Porphyry copper, 170,000 tons mined/day (tpd) 451 Mt reserves: 0.38% Cu, 0.007% Mo (2007 Teck Cominco report) 90% of production from Valley pit Copper concentrate with gold and silver, Molybdenum concentrate N Valley Pit H‐H tailings dam Concentrator
A ratio indicates the relationship between two (or more) things in quantity, amount, or size. Proportion implies that two (or more) items are similar, differing only in magnitude. Using these well-known mathematical tools is a simple process. When preparing preliminary estimates, two methods for estimating the cost of equipment are the
The technique aids in the identification of losses and discrepancies at each stage of the mining value chain; and the advantage this presents is that management is able to undertake optimized approach towards effective operations. 5.4. Calculation of Reconciliation Factors 5.4.1. Traditional Methods
mining method economics With all the rigour to calculate a constrained (by the mining method) grade tonnage curve it is first necessary to calculate (estimate or simulate) the resources in blocks and then to simulate the mining method afterwards to obtain the minable reserves. The problem
We will illustrate this method with charts on the other page, (link above, or below). One thing that is worth keeping in mind is that mining stocks very often trade at a higher price than the NPV of their assets. This is because mining stocks also offer leverage to commodity prices. Paul Van Eaden again: “…Take a gold mining company as an
Mar 24, 2017· The tonnage in each block of ore is, of course, the volume in cubic feet divided by the cubic-feet-per-ton factor (or similar calculations for metric units). When it comes to actual mining, it often happens that the tonnage is greater and the grade of ore lower than estimated. This often is due
mining ventures, as a major problem facing the future of metal mining in the western United States (U.S. Forest Service 1993). Acid mine drainage from coal and mineral mining operations is a difficult and costly problem. In the eastern U.S., more than 7,000 kilometers of streams are affected by acid drainage from coal mines (Kim et al. 1982).
Should you require a more accurate tonnage calculation instead of the non-calculated “Assigned Formal Tonnage”, use Form 4A or 4B (see below). In addition to the non-calculated “Assigned Formal Tonnage” and as an option, if chosen by the ship owner instead of the full measurement by the appointed Tonnage Measurer, the Simplified Method
Many of the particles encountered in mining are characterized by sieves (classifiers). Recent advances in computers, cameras, and software make image analysis practical for samples with sizes larger than several microns in diameter. As particle size decreases, sieving and/or dynamic image analysis becomes more arduous or impossible and laser diffraction becomes the technique of choice.
Cubical opening method Dig up a pit of 1mx1mx1m size and weight all the material this weight is tonnage factor. For sulphide ore deposit at initial exploration this method is not applicable. In case of iron ore , limestone, rock Phosphate is applicable. in the mining stage normally bulk density is determined by this method Conventional density
the mining technologies currently in use on Federal leases and the potential for commer-cial mining technologies to extract Federal coal reserves from deep underground seams. The chapter discusses: three surface mining techniques that are used in the West: 1) area strip, 2) open pit, and 3) terrace pit; two methods of underground mining in
Oct 04, 2019· 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. In a practical underground and open pit setting, the ore recovery is affected by three main factors as follows: Ore wedges located at the top and bottom sills of the panel are unable to be
Tonnage, shape, grade and mineral content can be estimated with reasonable level of confidence. Location of boreholes, pits etc are too widely spaced. • Measured Mineral Resource (331): that part of mineral resource for which tonnage, density, shape, grade and mineral content can be …
Abstract. For the calculation of the volume and the tonnage of ore deposits there is a variety of available methods to choose from, each suited for a particular deposit. These methods fall into two categories: reserve calculation on the basis of cross-sections and on the basis of longitudinal planar sections or level plans respectively.
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
has focused on oil and gas. Would the methods for, say calculating the resource rent, valuing the stocks, etc., be applicable also for other mineral resources? 9. In line with these, is the NPV the most appropriate method in valuing resources? What about the other valuation methods? Mineral Resource Valuation Approaches and Methods 10.
Analysis of Economic Evaluation Methods of Environmental Damage at Calculation of Production Efficiency in Mining Industry Grigory B. Malyshkov1, Leonid S. Sinkov2 and Liubov A. Nikolaichuk3 Department of Economics, Accounting and Finance, Saint-Petersburg Mining University, Vasilyevsky Island, 21 Line, 2, Saint-Petersburg, 199106, Russia.
Measurement of fragment size of blasted rock is considerably important in order to evaluate the efficiency of the production blasting operation. There are several methods of size distribution measurement and fall under two broad categories; direct method and indirect methods. The sieve analysis is the direct and accurate method of measuring size
Jan 21, 2016· The standard method of making these estimates is to find the cubic contents of triangular prisms, in the apexes of which the drill holes are placed, by multiplying the surface area by the average depth of the ore in the three drill holes and then multiplying the cubic contents by the specific gravity of the ore or rock to find the tonnage.
§ 69.209 Calculation of tonnages. (a) Gross tonnage. (1) Except as in paragraphs (a)(2) through (a)(5) of this section, the gross tonnage of a vessel designed for sailing is one-half of the
equipment selection process into three phases i.e. type of fleet, size of equipment and calculation of required numbers, the present article focuses on different application methods in each of these phases, their advantages and shortcomings. Keywords: Surface Mining; Equipment Selection; sizing Equipment, Fleet Selection 1. Introduction
Feb 27, 2016· Mining is the mother industry for other industries. For effectiveness in mining, different methods have been approached keeping in mind the production and safety. One of such methods is the Bord and Pillar method of mining. Bord and Pillar method of mining is one of the oldest methods. 3.
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
Mining method selection is the first and most important problem in the mining method selection and demonstrates the calculation of the weighting factors for each selected parameter. This study has mineable ore tons, orebody grades and mineral value. Technical factors such …
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 gravity using the specific gravities of individual minerals (Table 4), provided the relative percentages of ore minerals present are accurately known.
Narrow veins are major sources of many commodities, including gold, silver, tin, tungsten, coal, uranium and sometimes copper, lead and zinc. 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.