How To Average Grades With Different Weights Before The Final Reserves Estimation

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Reserves Estimation

In the CGS system, metric tons are calculated by multiplying the economic weight of the mineral by the total cubic meter. In the FPS system, the total volume in cubic feet must be divided by the number of tons. A metric ton represents the number of cubic meters in one ton of material. The average ton can be calculated using the formula: 2240 / 62.5Xg cubic feet, where g is the weight of the material.

The total stock in an area can be determined by dividing the volume by the average tonnage. Weight calculations should be taken into account for the presence of pore spaces, fractures, and holes in the mineral body.

In order to estimate the reserves, the first step is to plan to divide the area of ​​the mineral deposit into several blocks of reserves. On the drawing paper, each hole or hole is a unit.

For each block, the area of ​​influence needs to be calculated. The volume is obtained by multiplying the area by the actual width of the mineral body. The behavior of the deposit determines how the area is calculated.

The total tonnage can be calculated by multiplying the tonnage in each block. Average weight (A) is given by the formula:

T1A1+T2A2+T3A3… T10A10/ T1+T2+T3… T10

If there are 10 stocks in the stock and the age of each is taken as, T1, T2, T3, and the grade is shown as A1, A2, A3.

There are two main ways to find the area of ​​blocks such as 1. Geometric, and 2. Graphic.

These include area methods, open areas, triangles, and polygons that fall under the previous category. In the last category, there are isochore drawing methods, stratum contours, transverse section methods.

Before using any method, the mineral zone needs to be defined based on the geological knowledge of the area such as the continuity of the material, the shape of the structure, the pitch, etc.

If the holes or the holes are made in a grid pattern, it is better to use the area. In this way, the area of ​​influence and therefore the weight in the central hole or well is doubled and quadrupled in the sides and corners. All blocks have the same area of ​​effect in the extension method. Triangle and polygon methods can be applied to non-linear patterns of sample points.

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