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Proven reserves of what?

If you are talking about petroleum,

Proven reserves are those quantities of petroleum which, by analysis of geological and engineering data, can be estimated with reasonable certainty to be commercially recoverable, from a given date forward, from known reservoirs and under current economic conditions, operating methods, and government regulations.

~ Definition given by Society of Petroleum Engineering

For example:
Proven oil reserves in Saudi Arabia are estimated to be 267 billion barrels.

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