La Rosa Project
| Location: | Sinaloa State, 15 kilometers north of Mazatlán, Mexico. |
| Area: | One concession called La Rosa totaling 970 hectares. |
| Minerals: | Silver, Gold and Copper |
| Status: | No drilling, some past artisanal mining, developing drill targets |
| Ownership: | 100% - Available for Joint Venture or purchase |
History:
La Rosa is located 6.5km south of the San Pablo copper-gold porphyry project that the Consejo de Rescursos Minerales drill tested with four holes in 1998. The more famous Tropico project (copper, palladium, platinum, and gold in ultra-mafic rocks) lies 12km to the northeast.
Artisanal mining and prospecting on the property was being carried out as recently as the late 1970's. in at least 2 different areas on the property. Local inhabitants indicate that high-grade silver was the main target of the past work. Mining was done from shallow surface cuts and pits.
Property Geology:
The geology of the La Rosa project consists of east-west trending quartz shear veins and quartz stockworks hosted in an argillized and oxidized portion of the granodioritic Sinaloa batholith. The batholith appears to be deeply weathered and mainly forms low rolling hills that have mostly been cleared of trees and brush for farming.
Mineralization:
Initial rock chip sampling on the La Rosa prospect returned up to 15m of 0.787 gpt gold and 164 gpt silver. At least two east‑west trending parallel zones of shear quartz veining and quartz stockwork occur on the property and can be traced for more than a kilometer. Diggings up to 10m wide and 5m deep occur along both shears but most are found on the shear vein known as La Platosa. The second shear lies some 275m to the north of the La Platosa shear. Additional east‑west shear veins occur on the property and remain be investigated.
Two north-south trenches spaced approximately 100m apart were dug across the shear located 275m north of the La Plataso shear. Chip samples from those trenches returned several short intervals of anomalous gold and silver (up to 4m of 0.376 gpt AuEq). A third trench across the La Platosa shear itself returned 10.5m of 0.760 gpt AuEq. Mineralization in that trench remains open to the north.
A total of 36 reconnaissance rock-chip samples were collected on the La Rosa property prior to the trenching and they returned gold, silver, and copper values of economic interest. The table below provides a summary of that sampling.
Element |
Highest value |
Lowest value |
Mean value |
Gold |
1,130 ppb |
<5 ppb |
177 ppb |
Silver |
208 ppm |
<2 ppm |
29 ppm |
Copper |
3.1% |
6 ppm |
0.37% |
Arsenic occurs in association with the gold, silver, and copper, and values up to 1.7% were obtained from reconnaissance sampling. The average arsenic values in the 36 rock samples collected at La Rosa is 0.41%. The geologic and geochemical characteristics of the La Rosa prospect suggest the potential for the occurrence of bulk-tonnage style mineralization in low-angle shear zones that are typically called "detachment-type". More work on the La Rosa prospect is warranted.
