Borosi Oriental Oro-Plata La Luna
The La Luna deposit is located in the northeastern Borosi concessions and is part of the greater Eastern Borosi Project. The deposit is accessible by a well travelled gravel road from the town of Rosita. Historic production occurred however the exact production numbers can only be estimated. The La Luna mine produced ~5,000 ounces of gold and ~19,000 ounces of silver from a small open pit along a 300 metre section of the southern vein.
The La Luna vein system trends roughly 350°, dips steeply to the west at 80°, and is hosted in a sequence of andesite tuffs and minor porphyritic andesite. Reworked quartz breccias are present indicating that the structure was reactivated multiple times similar to the Riscos de Oro deposit. The principal vein is split into northern and southern sections that are separated by 350 metres of offset. Drilling was initiated in 2010 after a successful trenching program returned consistent gold values highlighted by 3.49 g/t/4.20m (trenching results are summarized below). The drilling in the southern portion of the vein confirmed mineralization to a depth of 110 metres beneath the historic open pit. The vein intercepts were found to be base metal-rich, often containing greater than 20% sulphide (see photos below), with a common mineral assemblage of pyrite, galena, and sphalerite. Drill holes along the northern part of the vein were spaced 250 metres apart and confirmed mineralization to depths of 115 metres below surface. In some sections veins were observed to form distinct upper and lower zones. Vein intercepts were 1.42 metres to 9.00 metres in width.
The La Luna resource was calculated using data from 2,159 metres of HQ diamond drill core in 11 holes and 280 metres of surface trenching over a 1.5 kilometer strike length. The La Luna gold-silver deposit remains open for resource expansion both along strike and at depth. A large, active, artisanal open pit is located immediately along strike of the southern section of the vein.
Significant drill intercepts from the 2010 Calibre drilling program
| HOLE ID |
FROM (M) |
TO (M) |
INTERVAL (M) |
GOLD (G/T ) |
SILVER (G/T) |
|---|---|---|---|---|---|
| LL10-001 | 115.70 | 123.45 | 7.75 | 1.43 | 7.51 |
| LL10-002 | 90.00 | 99.00 | 9.00 | 4.63 | 39.75 |
| including | 90.00 | 97.00 | 7.00 | 5.88 | 50.16 |
| including | 92.40 | 95.00 | 2.60 | 12.20 | 105.10 |
| LL10-004 | 110.72 | 117.00 | 6.28 | 1.63 | 13.61 |
| including | 110.72 | 113.00 | 2.28 | 2.11 | 13.49 |
| LL10-006 | 127.00 | 131.00 | 4.00 | 2.77 | 19.38 |
| including | 129.00 | 131.00 | 2.00 | 5.08 | 36.65 |
| 137.60 | 140.50 | 2.90 | 0.85 | 22.46 | |
| LL10-007 | 18.95 | 20.70 | 1.75 | 2.99 | 30.66 |
| 113.70 | 117.05 | 3.35 | 2.40 | 4.91 | |
| including | 116.39 | 117.05 | 0.66 | 7.14 | 8.66 |
| LL10-009 | 97.92 | 100.40 | 2.48 | 1.39 | 21.59 |
| 117.62 | 118.10 | 0.48 | 2.54 | 7.90 | |
| 121.50 | 124.60 | 3.10 | 1.59 | 18.45 | |
| 128.10 | 128.50 | 0.40 | 2.40 | 60.70 | |
| 138.55 | 139.00 | 0.45 | 2.75 | 35.50 | |
| 149.00 | 151.00 | 2.00 | 1.03 | 1.20 | |
| LL10-010 | 141.00 | 142.45 | 1.45 | 2.66 | 27.46 |
| 147.51 | 148.93 | 1.42 | 1.32 | 5.28 | |
| LL10-011 | 248.00 | 249.55 | 1.55 | 2.98 | 2.67 |
| Drill holes LL10-003, LL10-005, LL10-008 did not contain significant results. | |||||
Significant trench results from the 2010 Calibre trenching program.
| TRENCH | FROM (M) | TO (M) | METRES | GOLD (G/T AU) |
|---|---|---|---|---|
| BTR10-009 | 9.20 | 13.40 | 4.20 | 3.49 |
| BTR10-010 | 12.30 | 16.00 | 3.70 | 2.25 |
| BTR10-011 | 8.50 | 11.70 | 3.20 | 3.92 |
| BTR10-011 | 18.90 | 20.20 | 1.30 | 3.36 |
| BTR10-012 | 7.80 | 9.90 | 2.10 | 3.11 |
| BTR10-017 | 7.50 | 9.80 | 2.30 | 1.45 |
