The requirements of different mineral species for drilling!

Firstly. Iron, manganese and chromium

1. The core take rate of the prospecting hole (including the rocks within 5 m above and below the top and bottom plates) shall not be less than 80 %. When the core take rate is less than 80 % for 5 m in a row, the reason shall be identified and remedial measures shall be taken. The stratified take rate of the surrounding rock core shall not be less than 65 %. 

2. The drilling process used should be able to maintain the original structural characteristics and integrity of the ore and avoid crushing and depletion of the core. The length of drilling rounds and the rate of taking rounds should be strictly controlled in complex vein and multi-vein deposits to prevent ore leakage in drilling. When diamond rope core drilling is used, the diameter of the penetration hole should meet the sampling requirements.

3. Carefully measure the top angle and azimuth of the drill hole, and do a good job of hole depth correction, original records, simple hydrological observation, hole sealing and storage of ore and core. The curvature of the drill hole should meet the requirements of the regulations and geological design, and remedy the deflection of the drill hole in time. The bending degree of drill holes should be measured at the ore site and at the exit point of the ore body with thickness greater than 30 m. If the quality of hole sealing does not meet the requirements of regulations or design, the hole should be resealed.

Secondly, copper, lead, zinc, silver, nickel, molybdenum

The average rate of cores and cores within 3 m-5 m of the ore body and its top and bottom plates shall not be less than 80%, and the continuous length of cores within thick ore bodies with a rate of less than 80% shall not exceed 5 m, otherwise remedial measures shall be taken. The stratified average take rate of the surrounding rock core is generally not less than 65%.

The drilling process used should be able to maintain the original structural characteristics and integrity of the ore and avoid crushing and depletion of the core. In complex vein type and multi-vein belt type deposits, the length of drilling rounds and the rate of taking rounds should be strictly controlled to prevent ore leakage in drilling. When diamond drilling process is used, the diameter of the penetration hole should meet the sampling requirements. The air reverse circulation (CSR) drilling process is allowed for dense sampling holes.

Carefully measure the top angle and azimuth of the drill hole, and do a good job of hole depth correction, original records, simple hydrological observation, hole sealing and core storage. The curvature of the drill hole should meet the requirements of the regulations and geological design, and remedy the deflection of the drill hole in time. The top angle and azimuth of the drill hole should be measured at the ore site (and the ore body with a thickness of more than 30 m). If the quality of hole sealing does not meet the requirements of the regulations or design, the hole should be resealed.

Thirdly. Tungsten, tin, mercury, antimony

The average rate of core taking should not be less than 70%.

The rate of taking the ore body and its top and bottom plate 3 m-5 m of the surrounding rock, near the ore surrounding rock alteration zone, and the ore control structure mark layer is not less than 80%; if there are two consecutive times (or more than 5 m in the thick ore body) the rate of taking is less than 80%, remedial measures must be taken.

The core should be kept intact as far as possible, with special attention to the possible depletion or enrichment artifacts caused by the crushing of the core. For this reason, the length and drilling time of the drilling rounds should be strictly controlled for ore bodies with multiple vein zones and ore bodies controlled by broken zones; when diamond drilling technology is used, the diameter of the penetration holes should meet the sampling requirements.

In accordance with the quality requirements of the relevant regulations, the top angle and azimuth of the borehole must be measured carefully, and the work of borehole inclination measurement, hole depth correction, simple hydrogeological observation, original records, hole sealing and core storage must be done. The bending degree of the drill hole must meet the requirements of the regulations and geological design, and the permissible range of the azimuth deflection of the drill hole cannot exceed one-fifth of the spacing of the exploration line, and the deflection should be remedied in time. When the quality of sealing holes does not meet the requirements of the regulations or design, it is necessary to rework and reseal.

Fourthly, Rock gold

         Ore core and 3 m-5 m of the surrounding rock should be taken ≥ 80%. The top angle and azimuth should be measured and the hole depth should be measured when entering and leaving the ore body. Other engineering quality in accordance with the "Core Drilling Regulations".

Fifthly. Bauxite, metallurgical magnesite

Core drilling is used to explore the deep ore body and geological structure. Its engineering quality according to the "Core Drilling Regulations" implementation. The ore body and its top and bottom plate (including refractory clay, iron ore and other co-generated minerals) within 5 m of the core, core take rate shall not be less than 80%. When drilling in the ore layer, the return feed is generally not more than 1 m. If the take rate is less than 80% for two consecutive returns, remedial measures should be taken immediately. The stratification rate of rock layers shall not be less than 65%.

During the drilling process, the top angle and orientation must be accurately determined according to the provisions of the "Core Drilling Regulations". At the same time, simple hydrological observation, hole depth correction, original records and rock (mineral) core storage should be done. After the drilling is completed, the hole should be sealed according to the geological design requirements, and the hole mark should be buried. When the quality of hole sealing does not meet the requirements of the regulations or design, it is necessary to rework and reseal.

Sixthly, Rare metals

The average rate of core and rock core taken within 3 m-5 m of the ore body and its top and bottom plates is not less than 80%, and the cumulative footage of core taken within the thick ore body with a rate lower than 80% shall not exceed 5 m. The rate of rock core taken shall not be less than 65%. If the rock core does not meet the above requirements or the core selectively wears out seriously, remedial measures are required. The rock and ore cores are required to be kept in storage, coded, arranged in an orderly manner and properly stored.2. The drilling process used should be able to maintain the original structural characteristics and integrity of the ore and avoid crushing and depleting the cores. In compound vein type and multi-vein belt type deposits, the drilling return feed and return take rate should be strictly controlled to prevent ore leakage in drilling. When diamond drilling process is used, the diameter of the penetration hole should meet the sampling requirements.

Carefully measure the top angle and azimuth of the drill hole, and do a good job of hole depth correction, original records, simple hydrological observation, hole sealing and core storage. The curvature of the drill hole should meet the requirements of the regulations and geological design, and remedy the deflection of the drill hole in time. The bending degree of the drill hole should be measured at the ore site (and the ore body thickness greater than 30 m). If the quality of hole sealing does not meet the requirements of the regulations or design, the hole should be resealed.

When nail-in semi-combined pipe drilling is used to survey weathered crust deposits, the average rate of cores taken shall not be less than 85%, and 3%-5% of the holes shall be used for quality inspection by shallow wells. The number of survey holes in the mine area less than 50, check the number of shallow wells should not be less than 5.

Seventhly. Rare earth ore

Rare earth endogenous deposits and the top and bottom plate of the 5 m range of rocks and sign layer shall not be less than the requirements of the regulations to take the core rate (generally the average take rate of not less than 80%) or the requirements of the survey design. Thick ore body inside the core take rate, below the above requirements shall not exceed 5 m continuously, beyond 5 m, remedial measures should be taken immediately, otherwise the project will not be accepted and should be scrapped. Drill hole in and out of the ore body should measure the top angle, orientation, measurement of hole depth. Drill hole actual out of the mine point deviation from the design out of the vertical exploration line distance, should depend on the specific circumstances of the deposit. Drill holes should generally be logged. The cores of rock and ore should be protected, coded, arranged in an orderly manner and properly preserved.

For weathering shell ion adsorption type deposits, a small number of holes can be used to understand the relationship between the composition of bedrock material and the deposit, no flushing solution should be used, the original structure of the ore and the integrity of the core should be maintained.

Eighthly, kaolin, bentonite, refractory clay

Ore core take rate and the top and bottom of the 3m-5m above and below the ore layer core take rate shall not be less than 80%, the general core take rate shall not be less than 70%. For the larger thickness of the ore body, the core take rate requires continuous 5 m-10 m section average take rate of not less than 80%, stratified core take rate of not less than 70%.

Drill hole penetration diameter to meet the requirements of various sample testing shall prevail.

Underground mining construction holes must be strictly sealed, the quality of sealed holes should be taken 10%-20% of random sampling perforation inspection, the pass rate required to reach 100%.

For the use of mud (bentonite ore can not add alkali) when drilling, the core of the mine to take samples must be stripped of mud skin.

Drilling project quality requirements should be implemented "Core Drilling Regulations" provisions.

Ninthly, metallurgy, chemical limestone and dolomite, cement raw materials

Drill hole core take rate calculated by 8 m continuous, the average should not be less than 80%, the ore body of the sandwich stone, from the top and bottom of the ore body 3 m-5 m of the surrounding rock to take rate requirements with the ore body. Other cores should be taken at a rate of not less than 70% in general.

For open pit mines with depressions below the water table, the holes should be sealed according to the relevant regulations and design requirements.

Drilling quality requirements in accordance with the relevant regulations, regulations.

Tenthly, barite, toxic heavy stone, fluorite, boron ore

Drilling project should pay attention to improve the rock (mine) core take rate, the core take rate of not less than 65%, the core and ore body top, bottom plate (3 m-5 m range) take rate should be greater than 75%. Fluorite ore penetration hole diameter shall not be less than 56 mm.

In the drilling construction, the zenith angle and azimuth angle of the drill hole should be carefully measured, and the hole depth correction, original records, simple hydrological observation, hole sealing and core storage should be done.

If the hole deflection and sealing quality do not meet the requirements of the regulations and design, remedial measures should be taken in time.

Drilling works should be carried out in accordance with the "Core Drilling Regulations".

Eleventhly, glass silica raw materials, decorative stone, graphite, gypsum, asbestos, wollastonite, talc

Glass silica raw material rock type ore, decorative stone ore, gypsum ore, wollastonite ore, talc ore, graphite ore drill core take rate of not less than 70%, the core (including ore, mineralized inclusions, near the mine 3 m surrounding rock and important marker layer) take rate of not less than 80%, calculate the average take rate of stratification, the thickness of the large ore body, according to the average take rate of 5 m-8 m continuous calculation, drilling Pay attention to keep the core intact during drilling.

The stratified take rate of glassy-siliceous raw material sand ore layer is generally not less than 80% and not more than 130%, avoiding sand gushing during drilling.

The core take rate of chrysotile mine top and bottom slab surrounding rocks should not be less than 75%, other core take rate should not be less than 70%, the core take rate should not be less than 90%, selective abrasion and disturbance of asbestos fiber should be prevented during drilling, and strive to keep the core intact and clean.

Other quality requirements for drilling works follow the provisions of the "Core Drilling Regulations" promulgated by the Ministry of Geology and Minerals in 1982.

Note: This article is from the internet, Intercontinental Mining