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crushing equipment with low cost for silver ore mining

crushing equipment with low cost for silver ore mining

Mineral Processing Operating Cost Estimate of Ore Treatment

A typical example of cost distribution is to be found in the following 1936 figures for a 1000 ton per day flotation and cyanidation plant in Ontario, Canada.

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Consolidated Beattie gold mines is a good example of a large plant employing flotation, roasting, and the cyanidation of concentrates. Approximately 1300 tons per day of arsenical gold is treated for an overall cost of $1.05 per ton, distributed as shown in Table 98. The roasting cost works out at approximately $1.22 per ton of concentrate, distributed as shown in Table 99. At MacLeod Cockshutt Gold Mines, Ltd., the cost of roasting in 1941 1942 was 32 cents per ton milled or $1.25 per ton of ore roasted, while at Lake Shore mines for the same year the cost was about 80 cents per ton roasted.

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The 700 ton mill operated by the Standard Cyanide Co. in Nevada between the years 1939 and 1942, when it was closed as a result of government order during the Second World War, succeeded in making a profit from ore carrying as little as 0.06 oz. gold per ton. Cheap, open pit mining methods were used, and good extractions were obtained when grinding to only 3 mesh. These, among other factors, made for extremely low cost operation. The 596,482 tons milled yielded $1.86 per ton at a total cost of $1.18 per ton of which $0.52 was milling cost.

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The power required in cyanide plants varies with type of ore, fineness of grind, etc., but in general the range is 20 to 30 kw. hr. per ton of daily capacity. The power distribution at Preston East Dome mines in Ontario, Canada, is shown in Table 102. The relative distribution of power between the crushing and grinding sections will vary according to the fineness of crushing and the type of plant, but on the average these departments will together consume 60 to 70 per cent of the total power. Flotation. The power consumption for straight single product flotation plants varies, according to A. M. Gaudin, from 12 to 20 kw. hr. per ton, depending on the fineness to which the ore is ground. The average percentage power costs for the various.departments of seven United States producers is given in Table 103.

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The power consumption at Randfontein Estates, which is milling 13,000 tons per day by the older sand slime process, is shown in Table 104. Distribution figures for the new 2100 ton per day Marievale plant are shown in Table 105. Cyanidation and concentration of gold and silver ores

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