Coal reserves calculation method
First, the general concept of reserve calculation
(1) The general meaning of reserve calculation
The calculation of coal reserves is to calculate the reserves of coal. Since coal is solid and layered underground, the general formula for calculating its quantity is: Q = SxMxd where Q is the reserve; S is the area; M is the thickness of the coal seam; and d is the bulk density or weight of the coal.
From the above formula, it can be seen that the reserve of coal is the product of the area of ​​coal, the thickness of coal seam and the bulk density of coal.
The units of reserves should be unified with each other. If the reserves are tons (t), the area is square meters (m2), the thickness is meters (m), and the bulk density is tons/m3 (t/m3). However, the reserves of coal are generally relatively large, generally 10,000 tons, then the corresponding area is 10,000 square meters, and the thickness and bulk density remain unchanged.
(2) General requirements for reserve calculation
(1) The reserves here are the in-situ reserves of coal, without considering the losses during the mining process, nor the losses in washing and processing.
(2) Industrial indicators refer to industrial indicators of in situ reserves.
(3) There are deep requirements for reserves calculation. According to China's economic development status and technical capacity, the reserve depth is calculated. The minefields for the proposed large and medium-sized mines generally do not exceed 1000m, and the areas that are only suitable for small-scale wells generally do not exceed 600m. The depth of the old mining area does not exceed 1200m.
(4) The calculation range of each coal seam reserve must be within the exploration area.
(5) In general, wells that are mined horizontally should be level-calculated. The wells developed by Pingshuo should be divided into uphill and downhill to calculate reserves. Open-pit mining should be calculated in sections. In principle, reserves should be calculated according to the actual needs of production.
(6) When the types of coal are different, the reserves should be calculated by dividing the coal types.
(7) If there is a coal seam outcrop or a hidden outcrop, the weathering zone should be taken along the outcrop coil. Generally, the reserves are not calculated. However, if the total humic acid content in the weathered coal is greater than 20%, the reserves should be estimated. Coking coal should also be circulated out of the oxidation zone and the reserves calculated separately.
(8) The quality of the results of various exploration projects utilized in the calculation of reserves at all levels should be reliable.
(9) The coal seam inclination angle is not more than 60. When calculating, the reserves should be calculated on the projection map, and the coal seam inclination angle is greater than 60. When calculating, the reserves should be calculated on the elevation map.
(10) When the coal seam inclination is not more than 15. The reserves are calculated using the pseudo-thickness and horizontal projected area of ​​the coal seam; when the inclination is greater than 15. The reserves must be calculated from the true thickness and slope area of ​​the coal seam.
(11) When the thickness of the coal seam point is unrecoverable or the ash content exceeds the specified, in the case of regular variation, the insertable method can generally be used to determine the recoverable boundary. If the coal seam is not available due to the erosion of ancient rivers, magma intrusion or other structural influences, the recoverable boundary should be reasonably circled according to the specific conditions.
(12) When the thickness of the coal seam point is extremely thick or suddenly thin, the cause should be analyzed and appropriately treated according to the specific conditions.
(13) The calculation method of reserves and the adoption of various parameters and the calculation of the average value must be made according to the specific circumstances.
(14) The calculation result of reserves, in units of 10,000 tons, without leaving a decimal.
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