Data given:
The following data is given:
Table 1. Input for compositing
| Depth from |
Depth to |
gold |
| 0.0 |
1.0 |
1.00 |
| 1.0 |
2.5 |
2.00 |
| 2.5 |
5.0 |
3.00 |
| 5.0 |
9.0 |
4.00 |
| 9.0 |
12.0 |
5.00 |
| 12.0 |
13.0 |
-1.00 |
| 13.0 |
15.0 |
7.00 |
Table 2. Calculating composites from 0 to 2
| Depth from |
Depth to |
Sample value × Interval proportion |
Weighted value |
| 0 |
1 |
1.00 × (1/2) |
0.50 |
| 1 |
2 |
2.00 × (1/2) |
1.00 |
|
|
Composite value: |
1.50 |
100% of the composite interval is represented which is greater than the value of
Minimum percentage of sample to be included (75%).
Table 3. Calculating composites from 2 to 4
| Depth from |
Depth to |
Sample value × Interval proportion |
Weighted value |
| 2.0 |
2.5 |
2.00 × (0.5/2) |
0.50 |
| 2.5 |
4.0 |
3.00 × (1.5/2) |
2.25 |
|
|
Composite value |
2.75 |
100% of the composite interval is represented, which is greater than the value of
Minimum percentage of sample to be included (75%).
Table 4. Calculating composites from 4 to 6
| Depth from |
Depth to |
Sample value × Interval proportion |
Weighted value |
| 4.0 |
5.0 |
3.00 × (1.0/2) |
1.50 |
| 5.0 |
6.0 |
4.00 × (1.0/2) |
2.00 |
|
|
Composite value: |
3.50 |
100% of the composite interval is represented, which is greater than the value of
Minimum percentage of sample to be included (75%).
Table 5. Calculating composites from 6 to 8
| Depth from |
Depth to |
Sample value × Interval proportion |
Weighted value |
| 6.0 |
8.0 |
4.00 × (2/2) |
4.00 |
|
|
Composite value: |
4.00 |
Table 6. Calculating composites from 8 to 10
| Depth from |
Depth to |
Sample value × Interval proportion |
Weighted value |
| 8.0 |
9.0 |
4.00 × (1.0/2) |
2.00 |
| 9.0 |
10.0 |
5.00 × (1.0/2) |
2.50 |
|
|
Composite value: |
4.50 |
100% of the composite interval is represented, which is greater than the value of
Minimum percentage of sample to be included (75%).
Table 7. Calculating composites from 10 to 12
| Depth from |
Depth to |
Sample value × Interval proportion |
Weighted value |
| 10.0 |
12.0 |
5.00 × (2.0/2) |
5.00 |
|
|
Composite value: |
5.00 |
100% of the composite interval is represented, which is greater than the value of
Minimum percentage of sample to be included (75%).
Table 8. Calculating composites from 12 to 14
| Depth from |
Depth to |
Sample value × Interval proportion |
Weighted value |
| 12.0 |
13.0 |
-1.00 × (0) |
0.00 |
| 13.0 |
14.0 |
7.00 × (1.0/1) |
7.00 |
|
|
Composite value: |
7.00 |
100% of the composite interval is represented, which is greater than the value of
Minimum percentage of sample to be included (75%).
Table 9. Calculating composites from 14 to 16
| Depth from |
Depth to |
Sample value × Interval proportion |
Weighted value |
| 14.0 |
15.0 |
7.00 × (1.0/1) |
7.00 |
| 15.0 |
16.0 |
Interval not included in calculation |
0.00 |
|
|
Composite value: |
7.00 |
Since the end of the borehole is 15, the missing interval from 15 to 16 is excluded
in the calculation, even if Treat negative values as zero is
selected.
50% of the composite interval is represented, which is less than the value of Minimum
percentage of sample to be included (75%), so the composite is not saved.
Table 10. Values after compositing
| Depth from |
Depth to |
Composited gold |
| 0 |
2 |
1.50 |
| 2 |
4 |
2.75 |
| 4 |
6 |
3.50 |
| 6 |
8 |
4.00 |
| 8 |
10 |
4.50 |
| 10 |
12 |
5.00 |