Sample Preparation Procedure Metadata

Overburden Drilling Management, Ottawa, Ontario (ODM) / HMC separation (ODM standard)



Procedure Description

Laboratory: Overburden Drilling Management, Ottawa, Ontario (ODM)

Method: HMC separation (ODM standard)

Overburden Drilling Management indicator mineral grain separation.  The sample is separated into several size and magnetic fractions, as a precursor to mineral grain identification.  The procedure described here corresponds to the standard ODM flow chart.  See Figure 6 in GSC OF 3081.

The sample is disaggregated and screened with a 2mm mesh.  The <2 mm fraction is pre-concentrated with respect to density using a shaker table.  The table concentrate is then put through diluted methylene iodide (specific gravity of 3.2) and the heavy mineral concentrate is collected.  After a ferromagnetic separation, the nonferromagnetic heavy mineral concentrate (NFM-HMC) is screened to recover the 0.25-0.50 mm, 0.5-1mm and 1-2mm fractions for indicator mineral picking.  Numerous weights are recorded during the procedure, as listed in the table below:

1 Bulk received (kg)
2

Table split (kg)

(usually 0.5 kg less than the bulk received)

3 Oversize clasts ( > 2 mm) (kg)
4 Table feed
5

< 2 mm table concentrate total (g)

(should equal the sum of rows 6 + 7 + 8)

6 < 2 mm table concentrate heavy liquid separation – heavy liquid lights (g)
7 < 2 mm table concentrate heavy liquid separation – magnetic HMC (g)
8 < 2 mm table concentrate heavy liquid separation – non-ferromagnetic HMC total (g)
9

< 2 mm table concentrate heavy liquid separation – non-ferromagnetic HMC processed split total (g)

(usually equal to row 8)

(should equal the sum of rows 10 + 11 + 12 + 13 + 14)

10 < 2 mm table concentrate heavy liquid separation – non-ferromagnetic HMC processed split – < 0.25 mm (wash) (g)
11 < 2 mm table concentrate heavy liquid separation – non-ferromagnetic HMC processed split – < 0.25 mm (g)
12 < 2 mm table concentrate heavy liquid separation – non-ferromagnetic HMC processed split – 0.25 to 0.5 mm (g)
13 < 2 mm table concentrate heavy liquid separation – non-ferromagnetic HMC processed split – 0.5 to 1 mm (g)
14 < 2 mm table concentrate heavy liquid separation – non-ferromagnetic HMC processed split – 1.0 to 2.0 mm (g)

There are numerous variations to this technique.  Possible variations include:

  • the non-ferromagnetic fraction may be further separated, based on paramagnetism
  • samples may be run once or twice over the shaker table, and material from the different runs may be kept separate
  • the bulk sample may be screened with a 1mm mesh (not 2mm)

 

Sample Classification (Preparation)

IndexSample CountSurveySample BundleSample TypePrep Lab MaterialDuplicates count
210001210294 Till HMC separation (ODM standard)
55  210001210295 Till HMC separation (ODM standard)
210001210295 Esker HMC separation (ODM standard)
55  210001210297 Till HMC separation (ODM standard)
210001210297 Esker HMC separation (ODM standard)
26  210006210289 Till HMC separation (ODM standard)
57  210006210290 Till HMC separation (ODM standard)
210006210290 Esker HMC separation (ODM standard)
57  210006210292 Till HMC separation (ODM standard)
10  210006210292 Esker HMC separation (ODM standard)
11  49  210007210299 Till HMC separation (ODM standard)
12  49  210007210300 Till HMC separation (ODM standard)
13  25  210042210320 Till HMC separation (ODM standard)
14  25  210042210321 Till HMC separation (ODM standard)
15  25  210042210988 Till HMC separation (ODM standard)
16  25  210042210989 Till HMC separation (ODM standard)
17  35  310001310001 Till HMC separation (ODM standard)
18  29  310001310001 Esker HMC separation (ODM standard)
19  35  310001310004 Till HMC separation (ODM standard)
20  29  310001310004 Esker HMC separation (ODM standard)
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