The 3954.1 Ha Property, owned by Minera Camargo, overlaps a significant porphyry system centered in Southern Sinaloa State, Mexico, near geographic co-ordinates 105º45’W and 23º12’ N (1:50 000 map sheets F13A47 and F13A48). Mining concessions that define the Property (Table 7.1) were acquired by staking between 2003 and 2012 over the former “Viva Zapata” Mineral Reserve, a project that was acquired and explored by the Servicio Geólogico Mexicano (SGM) in the 1980’s (bon Aguilar & Bustamante-Yañez, 1987; Rodríguez-Rodríguez et al., 1984). Geographically, the Property overlaps the western foothills of the Sierra Madre Occidental (SMO). Geochemical work by the SGM at the turn of the millennium highlighted the Reserve as one of the largest contiguous anomalies for gold and base metals in southern Sinaloa and Northern Nayarit. Further, the United States Geological Survey shows that the size and amplitude of the copper anomaly underlying the Property is one of the largest in western Mexico, and compares well to active porphyry copper mining districts, including Piedras Verdes, Buenavista del Cobre and La Caridad in Sonora.
LiDAR topographic surveying has allowed for a confident interpretation of mineralized vein outcrop locations based on the historic mining excavations clearly visible from study of the 1 m contours provided. More than fifty gold-bearing polymetallic quartz veins have been mapped and sampled at differing levels of detail.
San Agustín is the best studied of the vein deposits. It is located on the faulted boundary (La Cocolmeca fault Zone or CFZ) of a metamorphic terrane that may contain strata as old as Jurassic to the northwest with rhyolitic volcanic rocks to the southeast. Principal minerals are electrum, gold, sphalerite, chalcopyrite and galena. The best overall results are 184.9 g/t gold, 61 g/t silver, 0.2% copper, >1% lead and >1% zinc across 1.2 m (HBM-73175) and 52.45 g/t gold, 139 g/t silver, 0.1% copper, 0.6% lead and 0.8% zinc across 1.4 m (MCA-65084). Historic workings are located along 400 meters of strike length, and drill testing has demonstrated over 200 meters of continuity in the subsurface.
La Flauta del Placer is a major northwesterly trending vein system more than 4 kilometers long and 100 to 200 meters wide that includes the northeasterly dipping Tarántula, Tatemales and Macuay Veins. No diamond drilling has tested La Flauta del Placer. Samples are from hand-dug surface trenches and across short underground adits that follow parts of these veins. The best overall result from La Tárantula Vein is 41.1 g/t gold, 41 g/t silver, 0.2% zinc and 0.2% lead across 1 meter (MCA-52258). Mineralization is hosted in welded rhyolitic ignimbrite of Paleocene or younger age that is faulted and invaded by dikes along the same fault planes that are mineralized with sphalerite, galena, bornite and gold. On the surface, the minerals are oxidized to anglesite, zincite and chrysocolla.
The geologic column hosting mineralization includes steeply westerly and southerly dipping metasedimentary and metavolcanic rocks of the Guerrero Terrane, northeasterly dipping rocks of the Late Cretaceous Tarahumara Formation and later Paleocene shoshonite intercalated with rhyolitic ignimbrite and flows. Porphyry copper stockwork deposits occur in three distinct plutonic complexes. Quartz monzonite that is probably Early Cretaceous (coeval with Tarahumara Formation) contains chalcopyrite stockworks that may be similar in age, or younger. Granodiorite of Paleocene age (known from U-Pb isotopic dating of contained zircon) hosts molybdenite that is also Paleocene (isotopic dating of Re-Os in molybdenite yields an age of 66.3 Ma). Alkali granite and orbicular monzonite porphyry cross-cut Paleocene ignimbrite and older rocks, and these volumetrically small but very specialized potassic magmas are probably the source of the unusually copper and gold rich deposits at Picachos compared to other camps such as La Rastra in El Rosario, and Panuco in Concordia.
El Rosario Mining District: 105º45’ West and 23º12’ North. Road-accessible from El Rosario and Cacalotan, Sinaloa, Mexico. The Property is adjacent to Vizsla Silver's Santa Fe concessions. Elevation ranges from 300 to 1300 meters. Minera Camargo has built 34 kilometers of internal roads.
4 contiguous mining concessions overlapping 3954 Ha. Granted until 2053 and renewable for second terms.
More than 50 gold-rich polymetallic veins
Geological potential for a significant porphyry copper deposit related to Early Cretaceous, Paleocene and Eocene granitoids
LiDAR topographic survey exactly locates historic excavations from gold mining
1747 m RC drilling
5057 m diamond drilling
13750 m underground sample lines and surface trenches
Surface access agreement registered with the Registro Agrario Nacional (RAN)
Water concession from CONAGUA for the purpose of exploration drilling
Permanent camp at San Agustín Mine
Submarine argillite of probable Middle Jurassic age occurs in a large roof pendant above foliated quartz monzonite in the southwestern part of the Property. The argillite is in contact with meta-andesitic rocks to the northeast. Easterly trending and steeply southerly dipping psammites occur intercalated with or above meta-andesites the center of the Property. Monzogabbro intrudes these metamorphic rocks.
Rhyolitic volcanics in the southeastern and norteastern part of the Property are tuffaceous conglomerates, pyroclastics, flows and subvolcanic stocks that are tentatively correlated to the Cuale Formation. Flows are characterized by hyaloclastite breccia and peperitic margins in argillite that characteristically develop in submarine environments.
The central part of the Property near the Cobre Vein is underlain by intermediate pyroclastic rocks that have a Campanian age of about 74 Ma measured using U-Pb isotopic dating methods of contained zircon under the supervision of Dr. Martín Valencia-Moreno of Universidad Nacional Autónoma de México (UNAM). These are correlated to the Socavón member of the Tarahumara Volcanic Arc. On the Property, the Socavón volcanics might be about 1000 meters thick and mostly dip northeasterly at about 50°. Foliated quartz monzonite may be coeval with the Socavón volcanics.
Hornblende granodiorite dominates the northwestern part of the Property. A Paleocene age of 66.3 Ma was measured from U-Pb isotopic dating of zircon by Dr. Martín Valencia-Moreno. Molybdenite was dated using Re-Os isotopic methods and yielded a near-identical age of 66.3 +/- 0.33 Ma. Other intrusions mainly form dikes and apophyses that cross-cut older plutonic and volcanic rocks. These include aplite, orbicular monzonite porphyry and alkali quartz granite porphyry. These volumetrically minor, but important alakalic intrusions are strongly minerlaized with copper, gold and other minerals.
The major structural element of the Property is a northeast trending fault (Cocolmeca Fault) that juxtaposes Paleocene bimodal rocks to the southeast against older rocks to the northwest. A U-Pb zircon date of 62.6 Ma was obtained from rhyolitic lapilli-tuff near Urrea Mine adit. Pyroclastic rocks are intercalated with shoshonitic trachyandesite lavas and intruded/overlain by flow-banded rhyolite flow-domes. Northwesterly trending extensional faults containing gold mineralization cut Paleocene and possibly younger pyroclastic rocks.
2017 to 2019: Minera Camargo sampled San Agustín, El Pino, Los Lentes, Urrea, El Salvador, Colorín, La Víbora and La Tarántula Veins from underground. Best result was 1 meter of 113.08 g/t gold and 62 g/t silver from San Agustin Mine. In 2020 Brigadier Gold drilled under El Carrito Mine (Mina #11) and obtained 7.45 g/t gold and 51 g/t silver across a true width of 7 meters, including 45.63 g/t gold and 82 g/t silver across 1 m from 76 to 77 m downhole. In 2023 Minera Camargo sampled the steep north face of La Flauta del Placer and obtained results of up to 41.10 g/t gold and 41 g/t silver across 1 meter (MCA-52258).
LiDAR topographic surveying completed by Eagle Mapping (Brigadier Gold - Picachos LiDAR Survey Report, 2021) has allowed for a confident interpretation of mineralized vein outcrop locations based on the historic mining excavations clearly visible from study of the 1 m contours provided. About fifty gold-bearing polymetallic quartz veins have been mapped and sampled at differing levels of detail. Not every compelling gold intercept has been assigned to a named vein, and further work will define additional structures.
