(value of ore - production cost)/ stripping cost = SRmax With this equation dete

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Question

(value of ore - production cost)/ stripping cost = SRmax

With this equation determine the SRmax of your operation, given the following information:

Assuming uniformity is the coal and the overburden, only 1ft2 – unit area – of the property needs to be analyzed

The seam is slightly dipping and you want to know at what depth you should stop mining

The seam itself is 20 ft thick

Tonnage factor of coal = 24.5 ft3/ton

Value of coal = $34/ton

Production Cost (excluding stripping cost) = $12/ton (you can convert this to $/sqft)

Stripping Cost = $0.70/yd3

Solutions (all per ft2): two decimal accuracy will be sufficient. Calculate the following (60 pts)

1) Volume of coal = (ft3)

2) Tonnage of coal = (tons)

3) Value of coal = ($/sqft)

4) Production cost = ($/sqft10008*0.8)

5) SRmax for the mine = (Cyd)/sqft

6) SRmax for the mine = (ft)/sqft

***PLEASE include work and correct units

SRmax = (value of ore - production cost) / stripping cost

Only 1ft2 – unit area – of the property needs to be analyzed

The seam is slightly dipping and you want to know at what depth you should stop mining

The seam thickness = 20 ft

Tonnage factor of coal = 24.5 ft3 /ton

Value of coal = $34 /ton

Production Cost (excluding stripping cost) = $12 /ton

Stripping Cost = $0.70 /yd3

Stripping cost = $0.7 yd3 = 2.59 /ton

SRmax = (value of ore - production cost) / stripping cost

SRmax = (34-12) / 2.59 = 8.49

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