The difference between a resource and a reserve mostly has to do with certainty that it can be mined.

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A resource refers to a deposit of material that has been identified and can potentially be mined, whereas a reserve is a known deposit that has been confirmed by exploration and is economically feasible to mine with existing technology and under current economic conditions. In other words, reserves have a higher level of certainty for economic viability than resources.

The Difference Between a Resource and a Reserve Mostly Has