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It is necessary to have a well-designed mine plan to maximize production and

profit in an operating mine, and this requires information on the potential for additional

resources in rock outside of current mining activities. At Guanajuato the proportion of

samples showing good evidence of boiling increases with depth to the deepest levels of

current mining activities and beyond in drill core (Fig. 17). This suggests that the bottom

of the boiling horizon is at some depth greater than that explored by mining and drilling,

and that additional precious metal resources are likely to be encountered in the future as

deeper levels of the Veta Madre system are explored and developed.

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