Analytical Suite Metadata

ODM Heavy Mineral Separation (<2 mm fraction)



Overburden Drilling Management, heavy mineral separation, <2 mm fraction.

General Methodology:

Overburden Drilling Management indicator mineral grain separation. The sample is split into several size and magnetic fractions as a precursor to mineral grain identification. This procedure is slightly different than the standard ODM flow chart (how, exactly?).

A +/-10 kg split from the bulk sample is disaggregated and screened with a 2 mm mesh. The 2 mm fraction is pre-concentrated with respect to density using a shaker table. Some samples are run through the shaker table once with the rejects being rerun subsequently. Other samples are run twice and the concentrates from each run are kept separate with both fractions being picked separately. The table 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. Numerous weights are recorded during the procedure, as listed in the table below:

1 Amount processed (kg)
2 Oversize clasts (>2 mm) (kg)
3

Table feed 1st sample run (kg)

4 First run < 2 mm table concentrate total (g) (not reported in Open File 3079, but should equal rows 5 + 6)
5 First run < 2 mm table concentrate methylene iodide (M.I.) separation - M.I. light fraction (g)
6

First run < 2 mm table concentrate methylene iodide (M.I.) separation - M.I. heavy fraction total (g)

(should equal sum of rows 7 + 12)

7

First run < 2 mm methylene iodide (M.I.) heavy fraction non-ferromagnetic fraction total (g)

(should equal sum of rows 8 + 9 + 10 + 11)

8 First run < 2 mm M.I. heavy fraction non-ferromagnetic processed split < 0.25 m (g)
9 First run < 2 mm M.I. heavy fraction non-ferromagnetic processed split 0.25-0.5 mm (g)
10 First run < 2 mm M.I. heavy fraction non-ferromagnetic processed split 0.5-1 mm (g)
11 First run < 2 mm M.I. heavy fraction non-ferromagnetic processed split 1-2 mm (g)
12 First run < 2 mm M.I. heavy fraction ferromagnetic processed split (g)
13

Table feed shaker 2nd sample run (not reported in Open File 3079, but should equal the table feed for the first run minus the table concentrate for the first run)

14 Second run < 2 mm table concentrate total (g) (not reported in Open File 3079, but should equal rows 15 + 16)
15 Second run < 2 mm table concentrate methylene iodide (M.I.) separation - M.I. light fraction (g)
16

Second run < 2 mm table concentrate methylene iodide (M.I.) separation - M.I. heavy fraction (g)

(should equal sum of rows 17 + 21)

17

Second run< 2 mm methylene iodide (M.I.) heavy fraction non-ferromagnetic fraction total (g)

(should equal sum of rows 18 + 19 + 20)

18 Second run < 2 mm M.I. heavy fraction non-ferromagnetic processed split < 0.25 m (g)
19 Second run < 2 mm M.I. heavy fraction non-ferromagnetic  processed split 0.25-0.5 mm (g)
20 Second run < 2 mm M.I. heavy fraction non-ferromagnetic processed split 0.5-1 mm (g)
21 Second run < 2 mm M.I. heavy fraction ferromagnetic processed split (g)

(Description taken from GSC Open File 3079 (1992 samples), page 8; see also the flow chart in this Open file on page 10)

Instrument: unstated

Sample material: solid

Sample weight: unstated


Analytical Technique:

Hierarchical classification

Technique >> Physical techniques >> Mineral grain separation

Children

None


Analytical Decomposition:

Hierarchical classification

Decomposition >> None

Children

None


Analytical Methods:

IndexMethod OrderMethod IDQuantityDetection Limit
1  6022     Wt_Processed 
2  6023     Wt_OvrSize 
3  6024     Wt_TblFeed_1 
4  6025     Wt_TblConc_1 
5  6026     Wt_MI_Lght_1 
6  6027     Wt_MI_Hvy_1 
7  6028     Wt_MI_NFM_Tot_1 
8  6029     Wt_MI_NFM_lt25_1 
9  6030     Wt_MI_NFM_25_50_1 
10  10  6031     Wt_MI_NFM_50_100_1 
11  11  6032     Wt_MI_NFM_100_200_1 
12  12  6033     Wt_MI_FM_1 
13  13  6034     Wt_TblFeed_2 
14  14  6035     Wt_TblConc_2 
15  15  6036     Wt_MI_Lght_2 
16  16  6037     Wt_MI_Hvy_2 
17  17  6038     Wt_MI_NFM_Tot_2 
18  18  6039     Wt_MI_NFM_lt25_2 
19  19  6040     Wt_MI_NFM_25_50_2 
20  20  6041     Wt_MI_NFM_50_100_2 
21  21  6042     Wt_MI_FM_2 

Associated Analytical Packages:

IndexPackage IDPackage Name
1  164     ODM heavy mineral separation and VG counts (<2 mm fraction table processed; table runs kept separate) [UNUSED]
2  247     ODM Heavy Mineral Separation (<2 mm fraction processed)
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