Yes, the income would be entered as "Other" since you didn't receive a 1099. There isn't a specific line for depletion on Schedule F (Farming). But you can enter this as a Miscellaneous Expense with a custom description. You don't own a royalty property, so Schedule E wouldn't be appropriate.
According to Depletion Percentages per Section 613(b), 5% of revenue for gravel percentage depletion is correct.
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