It's in mining.cs and active by default.

Code:
            // One ore per harvest action
            oreAndStone.ConsumedPerHarvest = 1;
            oreAndStone.ConsumedPerFeluccaHarvest = 2;

Note that there isn't any more ore in the vein than on other facets; you just get twice as much per "swing" of the pick/shovel.
 

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