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In calculating the Ratio of Concentration (R) of the mineral operations, the following formula has been found very useful. Assays of heads, concentrate, and tailing are required. Mill Water to Ore Ratio Requirements. Resistance of Various Materials to Crushing. Pulp Calculations. W—Tons of solids per 24 hours. R—Ratio of weights: …
However, the incremental strip ratio between the two pit shells is 8.9. Strip ratios represent the amount of waste material that must be removed in order to extract a given amount of ore. With that in mind, strip ratios are an indicator of risk, the general conversion being that the lower the strip ratio, the lower the mining cost which ...
In this formula, Vp is the total amount of stripping in the pit limit; and AP is the total amount of ore in the pit limit. The average stripping ratio indicates the total economic effect of …
The strip ratio (SR) is the simplest measure of mining efficiency. Defined as the weight of overburden (or waste ore) divided by the weight of oil sands ore, a strip ratio of 2 is considered high but feasible if the ore grade is high enough. A better measure of mining economics is the TV:BIP ratio.
The break-even stripping ratio is a function of ore value and the costs involved. If 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.
METHOD OF CALCULATION. The following calculations have described step-wise capital cost, various operating costs, formulae, specific cost for two systems with graphs, discounted cash flow, cost ...
AVERAGE STRIP RATIO: Total waste divided by total ore within the ultimate pit. CUTOFF STRIPPING RATIO: Costs of mining a ton of ore and associated waste equals to net revenue from the ton of ore.
The total mineral loss in mining and mineral processing is on average 37.2% of the actual production (metal content or final mine product) as the ore recovery ratio is 81% in mining and 90% in mineral processing. This corresponds to a vast amount of mineral loss for the world every year.
Enterprise Value (EV): The Enterprise Value, or EV for short, is a measure of a company's total value, often used as a more comprehensive alternative to equity market capitalization. Enterprise ...
The profit function can also be formulated in unit values (per ton or cubic meter of ore), by assigning a unit profit function L ′ ($/h), which is given by (2) L ′ = T U V − M − E R − B − F P. In all these variables, there are two geological characteristics, which have great importance: the stripping ratio R and the grade of ore T.It is therefore essential to …
The Instantaneous Stripping Ratio (ISR) is the stripping ratio for a given push back, where a tiny slice of material, i.e., ore and/or waste, is removed from a pit wall. This …
In coal mining: Choosing a mining method. …calculated with the aid of stripping ratios, which represent the amount of waste material that must be removed to extract a given amount of coal. Stripping ratios can also consider the selling price of coal, and a certain minimum profit can be added to the total cost of producing and….
Stripping Ratio. Environmental constraints. Strip Mining is normally chosen where the overburden thickness is such that excavation can be carried out by a single stripping machine such as a dragline. 8.6.2 Stripping Ratio. Overburden Ration = d/t. This is a depth ratio often used by geologists. Mining engineers use a volumetric ratio.
Thus the units for the stripping ratio will be yd3/ton. Two stripping ratios are used in the prefeasibility or feasibility analyses: overall stripping ratio and the maximum stripping ratio. As mine planning advances beyond the prefeasibility stage, stripping ratios at different cross sections will be calculated as well.
The SR max is determined solely by economics, to establish the ultimate boundary of the pit, where break even occurs, i.e. the profit margin is zero. As we defined it before, SR max ( yd 3 /ton) = Ore Revenue ($/ton)-Production Cost ($/ton) Stripping Cost ($/yd 3) (Equation 3.2.7) So, it is a physical quantity that is determined by economics.
In the above, the boundary optimization plan of the second mining area has been obtained through numerical calculation and stripping ratio section analysis, and the relatively large stripping part ...
The life-of-mine strip ratio is 4 to 1. Through the Osisko silver production agreement, Osisko Gold has the right to buy of the silver production in concentrate (less specified deductions) until reaching 19,300,000 ounces and subsequently 40% …
While designing the width of strip mining, the stability of this width strip coal pillar/filling belt is checked by equation (12). When it ≤ a, you can set b= a, when b>a, it is necessary to reduce the width of strip mining a, and then calculate the width of strip coal pillar/filling belt by formula (17) until b ≤a is satisfied, and set b=a.
Return-on-equity (ROE) is a key financial indicator considered by investors because it indicates the level of profit a company can generate from equity and return to stockholders. Average ROEs in ...
After going through this lecture you will be able to 1. list and define stripping ratios (K, C) 2. calculate various stripping ratios for given situations (C, Ap) 3. explain the influence of stripping ratios on planning decisions (A, S) 4. assess the most economic method of mineability of a deposit by surface mining or underground mining from the limiting …
1.4.1.1 By feeding conditions (slurry vs dry) The water- coal ratio is typically between 40 and 60% by weight. Slurry-fed gasifiers are typically more tolerant of variation of coal quality and rank. The IGCC cycle efficiency of slurry-fed gasifiers usually suffers slightly because high-grade energy produced from combustion is used to evaporate ...
In strip coal mining operations, the following are sometimes seen: Overbuden Thickness (ft) Overburden (yd 3 ) SR = SR = Coal Thickness (ft) Coal (tons) Stripping Ratios Instantaneous stripping ratio: The stripping …
where (Q_{{wr}}) are workable coal reserves, thou t; (k) is the coefficient taking into account the decline in annual production at the beginning and end of the mine operation (for coal and shale deposits mined by the open-pit method 0.92–0.96); (T) is the asset life of main mining equipment, years [].. In the case of block mining, the …
Computation of the ore-TMR coefficient utilizes the strip ratio and ore grade of the metal. We derive the ore-TMR coefficient, which is the ratio of the total material production (x) to the metal production at a given head grade (G). The strip ratio (SR) acts as a multiplier effect on the ore-TMR coefficient. Therefore,
At their most basic, strip ratios can be calculated by dividing overburden thickness by ore thickness. For example, an overburden thickness of 100 meters and an …
A method was proposed to calculate the earth pressure from a cohesionless backfill with a high aspect ratio (ratio of height to width of retaining wall). An exponential equation of slip surface was proposed first. The proposed nonlinear slip surface equation can be obtained once the width and height of the backfill as well as the internal friction angle of the backfill …
At their most basic, strip ratios can be calculated by dividing overburden thickness by ore thickness. For example, an overburden thickness of 100 meters and an ore thickness of 50 meters would...
The stripping ratio in a mine is chosen based on economics. A high grade orebody can support a high stripping ratio. A low grade ore body cannot support a high stripping ratio. Thus you may have a ...
Dilution is the waste material not separated from the ore in the stages of mining, and is sent to the processing plant. It is defined at the ratio of tonnage waste mined and sent for processing over the combined ore and …
Calculate the maximum stripping ratio if the total cost of production (excluding overburden removal) is $5.90 per ton of ore and overburden removal costs are $0.3 per ton of waste. Assume copper …
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