Good evening all and Happy Birthday Drew.
More family members with aligatoritus meant a quiet Sunday for us.
It gave me plenty of time to try and answer that question of how much a 20 ton pile of 14mm crushed gravel works out per rock.
First off I took random samples of rock from 3 different places on the pile. Each sample had exactly 100 rocks.
Sample 1 weighed 425 grams
Sample 2 358 grams
Sample 3 382 grams
[Sorry in advance to you QA pros - the kitchen scales have no calibration certificate and no doubt you would want a lot more samples]
Total sample weight 425 + 358 + 382 = 1165 grams
Average weight per rock = 1165 / 300 = 3.883 grams
Weight of pile = 20 tonne = 20,000,000 grams
Total rocks in the pile = 20000000 / 3.883 = approx 5.1 million rocks !
Price per rock = $1379 / 5.1 million = .027 cents per rock, which actually seems pretty good value
Anyone who has trouble getting to sleep at night is very welcome to check calculations and put me straight tomorrow