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Depends. 17 tons, give or take, is typical.
12 ton
1
8
260
103.41
1 cubic meter of gravel equals to 1400kg or 1.4 tons.
Approx 1.4T
About 1/4 ton.
At 12" depth, 20 tons of gravel will cover 360 sq ft.
(2222/9) times (the weight of 1 cubic yard of gravel, in tons)
16,000 tons