Analytical Suite Metadata
ODM sample disaggregation (2014-2015)
Sediment samples are separated by a combination of sieving/shaking, heavy liquid separation and ferromagnetic separation, in order to produce heavy mineral concentrates (HMCs) in several size fractions. The methodology corresponds to the standard methodology employed by Overburden Drilling Management (ODM) in 2014-2015.
Overburden Drilling Management indicator mineral grain separation. The sample is split into a series of fractions as a precursor to mineral grain identification. This procedure is the standard ODM (2014-2015) procedure.
A split from the bulk sample is disaggregated and screened with a 2 mm and 1 mm mesh respectively. Pebbles are screened from the > 2mm fraction and counted and classified. The < 1 mm fraction is pre-concentrated with respect to density using a shaker table. Samples are run twice through the shaking table and the concentrates are then panned, and gold grains are picked and counted. The table concentrate is then put through diluted methylene iodide (specific gravity of 3.2) and the heavy mineral concentrate (HMC) is collected. The HMC is ferromagnetically separated and the non-ferromagnetic heavy mineral concentrate (NFM-HMC) is screened to recover the 0.25-0.50 mm and 0.5-1.0 mm fractions to be sent to I.M. Morrison for indicator mineral picking. Samples with abundant indicator minerals in the < 1mm fraction are processed for heavy mineral concentrates directly by using diluted methylene iodide. The < 0.25 mm magnetic and non-magnetic fraction is micro-panned for gold. Pebbles are counted as they are being sieved and put into 4 broad classes; volcanics/sediments, granitics, limestone/carbonates and others).
(Description taken from Open File 6047)
|1||Wt_Bulk_Rcvd||The bulk sample is weighed when it is received by the laboratory|
|2||Wt_Archive||A portion of the sample is separated, weighed and put to one side as an archival split.|
The non-archived portion of the sample
[Wt_Bulk_Rcvd] = [Wt_Archive] + [Wt_Table_Split]
|4||Wt_gt200||The “Table Split” portion of the sample is screened with a 2mm mesh. The portion greater than 2mm is weighed.|
The <2mm fraction of the sample is run through a shaking table.
[Wt_Table_Split] = [Wt_gt200] + [Wt_Table_Feed]
|6||Wt_lt200_Tot||The weight of the table concentrate is recorded|
|7||Wt_lt025_Tot||The sample is sieved to separate the <0.25 mm fraction.|
|8||Wt_lt025_Light||The <0.25 mm fraction is subjected to heavy liquid (SG 3.2) separation|
|9||Wt_lt025_Hvy_Tot||The heavy (SG > 3.2) portion of the <0.25 mm size fraction is weighed.|
|10||Wt_lt025_Hvy_Mag||The heavy (SG > 3.2) portion of the <0.25 mm size fraction is ferromagnetically separated|
|11||Wt_lt025_Hvy_NonMag||The weight of the magnetic heavy (SG > 3.2) portion of the <0.25 mm size fraction is recorded|
|12||Wt_025_200_Tot||The weight of the > 0.25mm fraction is recorded|
|13||Wt_025_200_Light||The 0.25-2.00 mm fraction is subjected to heavy liquid (SG 3.2) separation|
|14||Wt_025_200_Hvy_Tot||The weight of the heavy (SG > 3.2) portion of the 0.25-2.00 mm size fraction is recorded|
The 0.25-2.00 mm fraction is washed with oxalic acid (C2H2O4), to remove any coatings adhering to the grains. The weight of the material removed by washing is recorded.
|16||Wt_025_200_Hvy_Mag_HMC||The washed 0.25-2.00 mm grains are ferromagnetically separated. The weight of the magnetic fraction is recorded.|
|17||Wt_025_200_Hvy_NonMag_Tot||The weight of the non-magnetic fraction of the washed 0.25-2.00 mm grains is recorded, prior to sieving into three size fractions.|
|18||Wt_025_050_Hvy_NonMag||The 0.25-0.50 mm fraction of the non-magnetic HMC|
|19||Wt_050_100_Hvy_NonMag||The 0.50-1.00 mm fraction of the non-magnetic HMC|
|20||Wt_100_200_Hvy_NonMag||The 1.00-2.00 mm fraction of the non-magnetic HMC|
Sample material: solid
Sample weight: unstated
|Index||Method Order||Method ID||Quantity||Detection Limit|
Associated Analytical Packages:
|Index||Package ID||Package Name|
|1||305||ODM HMC separation (2014-2015|
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