Blocking by Polygonal Methods
The blocking will be executed between three intercepts which have been appropriately sampled if the triangular method is used, in which it is considered that there exists a lineal relation between the difference of laws and the distance of all the drills. The strength of the block and the average law can be stretched by interpolation in a rectal line X = (A + B + C)/3 or by quadratic interpolation.
The blocking by polygonal methods presupposes that the area of influence of each drill is extended to the half of the distance of the other neighboring drills. The polygonous law is the law of the hole, the thickness is the height of the bank and the tonnage is given in function of the polygonous area.
Whichever law within a polygonous which has not been verified by a hole will be found by quadratic interpolation of the encircling neighboring holes.
The spacing between the prospecting and/or labors for an appropriate blocking can follow what is specified for the beds of placers, taking into account that in open stalls of mineralization very unchanging as in the sedimentary syngenetic deposits one can work with a net of prospecting of 200 m. Of interval, in the same form you can apply to the porphyry; on the other hand, in areas where geology is changing in short intervals as in the deposits of contact, the holes will be transversal to these in nets of prospecting of 50 meters.
For the estimate of mineral reserves, the secondary net of perforation will be taken into consideration.
Sampling Intervals
In the beginning, all the samples are taken in a transversal form to the orientation of the mineralization.
The distance between the samples is determined in function of the mineralization and the size of the mineral bed.