The test pit is a string of activities undertaken to observe the source of mineral ore deposits in the depths of the ground and to get the vein zone is oxidized in order to obtain rock samples from the soil characteristics. The purpose of the test pit gold mine drilling was to evaluate the value of gold content in the gravel surface and to search for the incidence of older gravel beneath glacial sedimentary units.
In a series of test pit gold mining activities to collect the test sample contained in the soil prior to exploration activities in areas that have analyzed the existence of economic mineral content of the ore, it is necessary to perform excavation activities at some point to get evidence of rock specimens which can then be analyzed in the laboratory.
Intake of rocks in the soil was aimed to obtain specific results of the analysis of economic ore mineral content in order to support the holding of an activity will step exploration. Investigations of rocks in the soil is done by digging a hole at a certain point in the detection of the existence of metallic elements and is usually done by digging test wells (test pit) or test trench excavation method (Trench).
In a series of test pit gold mining activities to collect the test sample contained in the soil prior to exploration activities in areas that have analyzed the existence of economic mineral content of the ore, it is necessary to perform excavation activities at some point to get evidence of rock specimens which can then be analyzed in the laboratory.
Intake of rocks in the soil was aimed to obtain specific results of the analysis of economic ore mineral content in order to support the holding of an activity will step exploration. Investigations of rocks in the soil is done by digging a hole at a certain point in the detection of the existence of metallic elements and is usually done by digging test wells (test pit) or test trench excavation method (Trench).
TEST PIT WITH AUGER - DRILL SAMPLING is an extraction method of the test pit with a hole at a certain point at coordinates that contain metals in the soil by using Auger Drill equipment. And this is one way of looking or seeing sedimentary strata in the soil by drilling.
When the test pit a detachable auger drill-rig mounted on the back end of a John Deer 544 rubber-tired front-end loader was used to drill 11 holes along selected target locations on the Swift Sovereign Property. The drill-string used consisted of 5-foot long 1-5/8 inch hex-pinned auger stems with 5.5-inch outside flight diameters.
The total drill-string length available for each hole varied from 90 to 120 feet. The length variation was due to occasional experiences with lost or damaged flights. Several 6-inch outside diameter drill bits were internally custom designed and built to penetrate boulders and bedrock. All holes were drilled vertically at a 90 degree inclination. One 5-foot length auger stem was converted to an experimental sampling tool by welding 1-inch flat bar upright in a helix along the outer flight perimeter.
When the test pit a detachable auger drill-rig mounted on the back end of a John Deer 544 rubber-tired front-end loader was used to drill 11 holes along selected target locations on the Swift Sovereign Property. The drill-string used consisted of 5-foot long 1-5/8 inch hex-pinned auger stems with 5.5-inch outside flight diameters.
The total drill-string length available for each hole varied from 90 to 120 feet. The length variation was due to occasional experiences with lost or damaged flights. Several 6-inch outside diameter drill bits were internally custom designed and built to penetrate boulders and bedrock. All holes were drilled vertically at a 90 degree inclination. One 5-foot length auger stem was converted to an experimental sampling tool by welding 1-inch flat bar upright in a helix along the outer flight perimeter.
At the time of taking samples from test pits done, the use of two drill holes was stopped for a while and examples of the depth intervals were collected in a bucket, then volumetrically measured as loose liters and converted to loose cubic yards. Then each sample results from the test pit was washed through the sluice system portable reverse - spiral drums and concentrate found are filtered through the screen mesh 3 / 8 inches.
The sieved concentrate was later processed through a Wifley Table Concentrator with an attached rotating magnetic separator. The final processed concentrate was panned and gold particles were collected for assessment. Sample recovery test pit was generally good for most dry and moist sediments drilled. Drilling through aquifers that caused freestanding water to accumulate on the bottom of a drill hole created conditions that significantly inhibited the retention of sediments along auger flights.
On the average, only 20% of the theoretical volume of gravel drilled was recovered when drilling in extreme wet conditions. It also appears that heavier aggregate, including concentrates and gold particles, have a higher tendency to fall away from the auger flights and have a less chance of retainment in wet hole conditions.
TEST PIT WITH TEST WELLS.
Simple method of test pit with test wells is a method of extracting process by making a hole at a certain point at coordinates containing the metal in the soil. And is one way in the search for or assurance of continuous sediment layers in the vertical direction. Making this test well done if needed greater depth (> 2.5 m).This test wells commonly performed on an exploration of deposits related to weathering and layered deposits:
- In the sediment layer results from the test pit, making the test wells intended to receive periodic layers in the direction of the slope, roof and floor lithology variations, layer thickness, and sediment characteristics in a vertical variation, and can be used as a location for example is usually made with a deep test wells to penetrate the whole layer of sediment mineralization which can be either gold vein
- In the sediment associated with weathering (laterite or residual), test pits with the manufacture of test wells intended to get the boundaries of the zone layer (soil zone, a zone of residual laterite zone), the thickness of each zone, the vertical variation of each zone, as well as in row Test wells can be done by using the form of sediment.
In general, test wells are made with a large opening 3m -5 m with a depth varies in accordance with the purpose of making the test wells. On lateritic sediment or residual While depth depends on the depth of the mineral sediment or bedrock (bedrock) and stability (stability) test pit with both walls. If no depth buffer test well in the range 4m - 5 m. In the framework of the test pits to get a sample of the shape and location of materials deposition in outline, and then dig some test with a regular pattern such as a rectangle or square (at the corner of the pattern has dug test wells) with regularly spaced well (100m - 500 m), except if the situation does not allow field or topography. With the depth, size and distance from the test wells is limited.
Some things to consider in the manufacture of test wells for the test pit activities are:
Some things to consider in the manufacture of test wells for the test pit activities are:
- The thickness of the laterite zone or residual at the location of manufacturing activity held test pit
- The possibility of harmful gases that emerged as CO2 or H2S gas
- Ground water level
- The strength of the walls of the hole that was made, and
- Hardness of bedrock.
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