Lesson 1/Learning Event 2
First convert the depth of the face to yards:
Then enter the values into the equations:
depth x working area
= Qt[l - (W/100)]
10 yds x 90,000 sq yds
900,000 CY of rock (bank)
900,000 CY x [1 - (10/100)]
900,000 CY x (0.9)
810,000 CY of usable rock (bank).
From Table 3, you find that one CY of average bank rock yields 1.7 CY of loose rock.
1.7 loose CY x 810,000 bank CY = 1,377,000 loose CY.
Therefore, your quarry should yield 1,377,000 loose CY of usable product.
TABLE 3. WEIGHT-VOLUME RELATIONSHIPS