Mineralized OreBodies

Case of one Subterraneous Digging
Ores that have been proven and probable around such work will be considered as long as there exists geological continuity in the area.

Case of two or more Horizontal Diggings in one Level
In this case there must be enough geological evidences. The horizontal dimension of the tested and probable ore will be determined by adding the mineralized economic limits.

Case of two or more subterraneous horizontal diggings in different levels of the same mineralized body: 
Delimiting the body in each level, one or two blocks of proven, probable and sometimes prospective mineral will be formed amongst both levels, according to the separation of these and the available geological evidences.

Calculus of Areas, Volume and Laws
The areas will be determined by geometrical procedures (simple forms) or with a planimeter (irregular forms). The volumes according to the geometry of the mineral blocks. The average laws will be determined with the pondered average of the longitudes or mineralized areas.

Tonnage Calculus
The product of the volume by specific gravity is how the tonnage of each mineral block is obtained.

Factor of Correction (Factor of Security)

Factor of Correction of Tonnage
A factor of correction of tonnage will be considered to the tonnage no less than ten percent by sterile zones, to the bridges and pillars that can be left in the exploitation and to the losses during the extraction of the mineral.

Factor of Correction to the Laws by Mistake of Sampling and Rehearsing
The laws in each block should be corrected in a percentage that can be between five and fifteen percent for the element PB, Zn and of 10 to 20 percent for Au and Ag elements.