Blocking and Calculus Open Stalls Reserves

All the studies of open stalls which are presented must include the following information:

1. Detailed geological studies through drafts of mineralization for banks with presentation of transversal and longitude cuts at intervals of 50 m. And to a scale of 1:500.

2. Labors and/or prospecting of proving of the mineralization executed for the estimation of the tested and probable reserves.

3. Drafts of samplings for banks and samplings of exploited areas.

4. Minimal law of exploitation for the deposit and for each bank.

5. Inventory of the Geological Mineral Reserves (classified in the inventory of mines, the marginal and inframarginal minerals).

6. Calculus of exploitable mineral reserves for banks in function of the angle of stability of the stall, with volumes of grubbing and coefficients of clearing of trenches for each bank, and showing the final limit of the stall and the cramps of access.

The blocking of the mineral can be performed by whichever of the following methods:

• a) Polygonal;
• b) Triangular;
• c) Statistic analysis;
• d) Transversal sections.