Question 34 An ore body dips at 90° and has a vertical depth of 140m. The top of the ore body is 180m from the surface a

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Question 34 An ore body dips at 90° and has a vertical depth of
140m. The top of the ore body is 180m from the surface and surface
mining operations have been discarded in favour of underground
operations. The strike length of the deposit is 350m. The ore body
varies from 8m to 20m and averages 15m. Grades are as follows: Lead
= Zinc = Silver = Gold = 10% 15% 120 g/t (90% recovery) (85%
recovery) (60% recovery) (50% recovery) 2 g/t What is the total ore
resource in tonnes, assume an SG of 3.6, and what is it worth at
today's metal prices in A$? Note: to calculate the worth of an ore
body recovery must be considered. Recovery as quoted in the above
figures means mill recover