· APPLICABILITY OF BORD AND PILLAR METHOD The Bord and Pillar method is adopted for working. 1. A seam thicker than 1.5 m, 2. A seam free from stone or dirt bands. Stone or dirt bands, if present in a seam, can be easily disposed of for strip packing in long wall advancing method of mining.
Online calculator to calculate the surface area and the volume of a Frustum given its radius R at the base, its radius r at the top and its height h. (see figure below). This calculator also calculates the parameters needed for the construction of a frustrum given R, r and h. If you cut the frustrum along the along the slanted height H, you ...
But you can calculate it using some custom formulas. So today, in this post, I''d like show you how to calculate ratio using 4 different ways. Let''s get started and make sure to download this sample file from here to follow along.
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· Other articles where Stripping ratio is discussed: coal mining: Choosing a mining method: …calculated with the aid of stripping ratios, which represent the amount of waste material that must be removed to extract a given amount of coal. Stripping ratios can also consider the selling price of coal, and a certain minimum profit can be added to the total cost of producing and…
How to Calculate LTIFR and Other Health and Safety Indicators By Tom Gardener Knowing how to calculate LTIFR and other safety indicators is an important skill to have if you work in the health and safety field. Despite the fact that these indicators don''t reveal a great deal of useful information managers love them and will insist on knowing what they are. They will use them to measure ...
· Surface and New Building Deformation Analysis of Deep Well Strip Mining. Yuanzhong Luan,1 Yue Dong,1 Yanhe Ma,1 and Liyuan Weng 1. 1College of Geodesy and Geomatics, Shandong University of Science and Technology, Qingdao, China. Academic Editor: Zhaohui Li. Received 21 …
· Combining Eq. (14) and Eq. (15) gives the following equation for calculating the crack energy in joules per centimeter directly from the standard work index and product exposure ratio: Ce = .0496 Wi100 Sg/log (Erp + 0.28) + 0 From Eq.
· Best Answer. Copy. We divide the overburden thickness by ore thickness to get the stripping ratio For example if we have an overburden thickness of 80m and ore thickness of 50 m, then the ...
115 Calculating Powder Factors The POWDER FACTOR is a relationship between how much rock is broken and how much explosive is used to break it. It can serve a variety of purposes, such as an indicator of how hard the rock is, or the cost of the explosives
· Among useful features are mining profit ratio (%) and profit in monetary terms. Below, they display a profit table. What''s interesting is that the values are updated in real time once you enter your hash rate, power consumption, kilowatt-hour cost, and pool commission, so you don''t have to wait for the new page to load.
· The ratio of the gold-zinc alloy would give a formula approaching Au. Zn3, which seems to be sufficient for parting. It therefore follows that zinc could be substituted for silver in this operation. It has the advantage of being cheap, of forming an alloy at a low
· Highwall mining of thick (up to 30.48 m) steeply dipping (20 or more) coal seams provides many challenges, both geotechnically and operationally, as seam dips near or in excess of highwall mining machine capabilities are encountered. Maximizing coal recovery ...
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.
1.4 Stripping Ratio Stripping ratio is defined as the ratio of the Overburden/Cover Rock / Waste Rock to the ore body. The various stripping ratios that are used in surface mining are the following: 1. 2.
Step 2: Use formula to calculate the fill volume between stations - Volume fill = (100ft 2+40ft )/2 x 100ft = 7000 ft3 Step 4: Convert Cubic Feet to Cubic Yards - CY soil = CF soil/27 = 7000 ft3 /27 = 260 CY Fill To figure out what is the total net cut/fill between ...
Total Current Liabilities = $440,000. Previous years quick ratio was 1.4 and the industry average is 1.7. Calculation of acid test ratio formula: Quick ratio formula = (Cash + Short-term marketable securities + A/c''s Receivable) / Current Liabilities. = ($200,000 + $60,000 + $40,000) / ($440,000)
· By adding the volumes for each cell together the total cut and fill volumes for the project can be estimated. The cut or fill depth for each cell is found by subtracting the average existing level of the cell from the average proposed level. If the resultant depth is positive then this is a fill cell, while a negative value indicates a cut cell.
Basing on the geological mining condition under villages at Xiaotun Mine, according to the existing theories of the strip-partial mining, using the method of analyzing the field measurements date and calculating by empirical formula, the safe range of mining and ...
The Coal Area Strip Mine Formula Strip Ratio = OB Thickness (in ft) * 11.11/ Coal thickness in inches Assumes coal is 80 lbs/ft^3 (good for bituminous) Area Strip Mine Geometry Geologic Stripping Ratio no accounting for rehandle or less than coal recovery
Threaded Hole / Fastener Ratio: Open - ISO Thread / Fastener Ratio and Length Calculator This assumes that the male and thread materials have the same strength. If the Material strength is lower i.e. J as calculated below is greater than 1 ...
62 ENGINEERING MANUAL Required data for belt calculation Required operation data Please add a sketch of the conveyor layout. Please describe operation conditions (e.g.abrasive conditions,environmental conditions, special operation requirements) in detail.
· K = F /C = (c — t)/ (f-t) = the concentration ratio. At operating plants, it is usually simpler to report the K based on assays. If more than one mineral or metal is recovered in a bulk concentrate, each will have its own K with the one regarded as most important being reported as the plant criteria.
The area of ore Ao is: Ao = A1 = 200 * 100 + 50 *150 = 27,500 ft2 The area of waste Aw is Aw = 2A2 = 100 * 100 = 10,000 ft2 The overall stripping ratio SR (overall) is: A w 10,000 SR (overall) = = = 0.36 A o 27,500 3 f Bench 7 Deepening of the pit by one bench (bench 7) requires the removal of 2A3 of waste.
· and % Pb in perfect concentrate = 11.545 x 5 = 57.7%. and % Cu in perfect concentrate = 11.545 x 1 = 11.54%. or, directly by (32), % Pb = 86.58 x 5/5 + 2.5 = 57.7%. Similar formulas for other mineral associations, for example, galena and chalcocite …
Information Gain, Gain Ratio and Gini Index are the three fundamental criteria to measure the quality of a split in Decision Tree. In this blog post, we attempt to clarify the above-mentioned terms, understand how they work and compose a guideline on when to use which.
· SR (Overall) = Volume of Waste/Volume of Ore. For Example: Determine the Stripping Ratio of the ore section (green zone) shown below: We know; SR = Waste/Ore, therefore; SR = 2500/5000 = 1:2 (i.e. 0.5) (i.e. one unit of waste is removed to recover 2 units of ore) Note: We proceed by determining the area of waste materials by calculating the ...
Aalto University, P.O. BOX 11000, 00076 AALTO Abstract of master''s thesis II Author Ville Roitto Title of thesis Slurry flows in metallurgical process engineering – Development of tools and guidelines Department Biotechnology and Chemical Technology ...
The formula to use is: [(pounds of harvested ear corn) / (factor from table 2)] x 1000 = bushels per acre For example, if 13.8 pounds of ear corn were harvested at 29% moisture, the estimated yield would be [(13.8 ÷ 86.7) x 1,000] = 159 bushels per acre
Rm-Rf: Expected Return. However, It is usually the rate at which the government bonds and securities are available and inflation-adjusted. The following formula shows how to arrive at the risk-free rate of return: Risk Free Rate of Return Formula = (1+ Government Bond Rate)/ (1+Inflation Rate)-1. This risk-free rate should be inflation-adjusted.
formular for calculating strip ratio in mining « gravel ... formular for calculating strip ratio in mining . formular for calculating strip ratio in mining ... Estimating Average Total Cost of …
M as per the given formula and used to select a belt type. With calculable effective pull F U. Conveyor and processing belts * accumulated goods 5 c 3 constant (is valid for drive drum) Power P A at drive drum Motor power P M required Transilon V3, V5, U2, V1 ...
· In coal mining: Contour strip miningIf the break-even stripping ratio remains favourable, further cuts into the hillside will be made. Otherwise, if there are sufficient reserves under the knob of the hill, the coal may be recovered by underground mining or by augering.
The Coal Area Strip Mine Formula • Strip Ratio = OB Thickness (in ft) * 11.11/ Coal thickness in inches – Assumes coal is 80 lbs/ft^3 (good for bituminous) – Area Strip Mine Geometry – Geologic Stripping Ratio – no accounting for rehandle or less than 100
Stripping Ratios: What are They and Why are They Important ...