Chip Sampling In Mining

The current chapter overviews the most common techniques that mine geologists are using for sampling mine workings for delineating ore bodies estimating. Sawn channel sampling uses a rock saw to provide a high quality sample that is comparable in accuracy with good-recovery drill core through the same zone.

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It is more associated with exploration programs.

Chip sampling in mining

. The average sample weighs about 4 pounds and individual pieces have a maximum diameter of 1 inch. This method is not usually considered a reliable one. In some cases the channel may also be cut along a line making a small angle with.

This method is used only in a preliminary investigation. The sample source may be a line or a grid laid out on the face of an exposed outcrop. Chip or point sampling The method is less laborious and used as a regular method of known samples is used for hard or uniform ores where it is difficult to cut channels.

RC drilling allows for uncontaminated chip samples and can be used in all formation types. Channel or Groove or Trench Sampling It is the most accepted method of sampling which best suited to bedded banded and vein type of deposits. CHIP SAMPLING This method is used to take samples from an outcrop.

A sample covers a width of 5 feet and the height averages 7 feet. This method consist of cutting channels across the face of exposed ore and collecting resulting chips fragments and dust from each channels to make a sample. The chips are taken in four lines across the face for the width of the sample.

Surface trench TA-TR-3b positioned oblique to the mineralized structure returned 178 gpt Au and 710 gpt Ag over 630 m 241 m true width including two high-grade intervals. Drift Mine Sampling. 1168 gpt Au and 3339 gpt Ag over 45 m and 570 gpt Au and 2920 gt Ag over 60 m.

It is typically used to sample exposure in mine openings or. Grade control strategy is related to mining method and orebody type. Grab sampling takes equal amounts of ore at selected intervals from a mine dump or muck pile.

Chip sampling in underground mines. Chip-channel sampling aims at providing an approximate indication of width and grade of an identified zone of interest. Nicola Mining Inc.

The tools are used hammer and chisel. Placers buried under deep masses of low-value gravel or capped by lava flows have been extensively worked in this manner. The results of all these methods are combined in order to determine the grade of the ore body.

Once the broken RC drill cuttings are recovered several methods of secondary sampling are used. Benjamin Hill Mining geologists continue to advance mapping and chip sampling for mineralization at Caracahui Sahauro and Sonora Copper mineralized areas. The results are unrepresentative of the actual state of mineralization.

Samples taken at the surface fresh and clean. RC drilling is the preferred primary sampling method in open- pit mining operations. Channel Sampling uses a compositing method to obtain the actual channel length that represents a minimum mining width.

Other mining sampling methods are bulk sampling channel sampling and chip sampling. Underground mining procedures are collectively known as drift mining where applied to placer gravels. Alternatively in many cases outcrops maybe either minor or non-existent and soil sampling is a key next step for an exploration programme.

Faces usually are sampled either by chipping with a pick or less commonly by cutting channels. While it is more expensive and requires more equipment than rotary air blasting its accuracy makes it one of the most popular mining exploration drilling techniques. It is primarily used for investigation.

Vancouver British Columbia--Newsfile Corp. Composite chip samples consist of a series of small chips collected over a larger area. Drift mining presupposes the concentration of values in a well defined stratum or channel.

Mapping and sampling at the Mina 2021 area also discovered a historic mining zone. Surface rock chip sampling at Tahonitas is designed to map the surface expression of mineralization. Collecting representative non-biased samples from rock faces and in particular sampling the broken ore is a non-trivial task which requires special sampling equipment and operational procedures.

The chip sampling returned a number of mineralized intervals including 3 metres of. This length is then used to create an ore composite including. The minimum mining width in the real vein thickness direction is projected onto the channel plane to obtain a length in the channel direction.

Rock chip sampling is sampling of exposed potentially mineral-bearing rocks. Outcrop Chip Sampling at the Dominion Property Returns Grades of 349 Grams Au and 176 Grams Ag per Tonne. It gives the confidence necessary to proceed to drilling.

Sampling methods include chip channel and panel samples grabmuck pile samples and drill- based samples. RC rigs are usually accompanied by a cyclone Figure 3a which is used to collect the borehole cuttings usually at 1. In this method the samples are collected by taking a small series of chips of rocks on a regular grid pattern from the working face in regular intervals.

The sample usually consists of material that is taken to be representative of a specific type of rock or mineralization. Chips are taken during initial mapping and if promising results are returned a subsequent soil sampling survey undertaken.

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