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minimum of $500,000. in cash of nonborrowed cash

Not sure if this is a math/ statistics question. Reserves are assets you hold, but are not using immediately. There are oil reserves, mineral reserves (like gold reserves) and cash reserves.

I think you need to rephrase the question for a proper answer.

Proven reserves are reserves we know about, potential reserves are those we suspect are present in certain geological formations. The combination of the two along with the estimated size of these reserves gives us the estimated total reserves.

What are proven-in-place reserves