TARGET: Gold-Copper Porphyry LOCATION: 15km from El Salvador Copper & Gold Mine SIZE: 8,796 Hectares OWNERSHIP: 100%, No NSR's
HIGHLIGHTS:• Potential to discover large bulk mineable copper – gold porphyry • 15 km from world class billion tonne El Salvador copper-gold porphyry mine • Geology is very similar to El Salvador mine • Property has not been fully and systematically explored • Previous exploration including drilling has returned encouraging copper grades • Located at relatively low elevation and readily accessible year round
REGIONAL AND LOCAL GEOLOGY:
Salvadora lies approximately 15 kilometers southwest of the El Salvador porphyry copper-gold deposit within the El Salvador region, which occupies an important sector of the porphyry copper belt of northern Chile. Exploration and production from the El Salvador and Potrerillos deposits and other prospects in the area indicates that the porphyry copper systems of El Salvador region are enriched in gold (>0.1 g/t Au) relative to the typical Chilean molybdenum-rich (>0.02% Mo) porphyry copper deposits.Salvadora is west of the Sierra Castillo fault, which represents the southern extension of a major fault system with which world class porphyry copper mines such as Chuquicamata, Escondida and Collahuasi are closely related. In the El Salvador region, the Sierra Castillo fault separates two lithotectonic domains with the western domain hosting the El Salvador porphyry copper district. The porphyry systems in the El Salvador region are related to stocks emplaced during two discrete periods: 45 - 40 Ma (El Salvador, Serra Jardin) and 37 - 31 Ma (Exploradora, Maria Dalia, Potrerillos, Coya). Late Cretaceous to early Tertiary volcanic sequences west of the Sierra Castillo fault hosts the older systems. Most of the copper produced to date at El Salvador came from granodiorite porphyry stocks dated at 42 - 41 Ma. Hydrothermal alteration centred on these stocks is characterised by a central zone of potassic alteration with chalcopyrite-bornite mineralization, accompanied by anhydrite and magnetite, grading laterally and vertically into zones with higher sulphide contents associated with quartz-sericite alteration. The system is capped by a late-stage, pyrite-rich, advanced argillic zone, the roots of which are exposed in the higher parts of Cerro Indio Muerto, representing the basal remnants of a lithocap.
Salvadora is situated within the western lithotectonic domain of the El Salvador region about 20-25 kilometers west of the Sierra Castillo fault. The Property covers a generally flat lying to gently northwest dipping sequence of stratified volcanic and volcano-clastic rocks of dominantly andesitic composition belonging to the Upper Cretaceous Llanta Formation. Locally Upper Cretaceous – Eocene sub-volcanic porphyritic stocks, plugs, sills and dykes of monzonitic, dacitic and rhyolitic composition intrude both the Llanta and El Salvador Formations. The more acid of these intrusive bodies are similar in character to the mineralizing porphyries of the El Salvador porphyry copper-gold deposits.
ALTERATION & MINERALIZATION:
The Salvador Property displays alteration characteristic of mineralized porphyry systems. Sericite and clay minerals are the most common alteration products associated with the mineralization itself while epidote is more commonly found proximal to the mineralized structures. Other alteration minerals include chlorite and carbonate. The picture on the right shows a leach cap at the Cerro Blanco zone with attendant chlorite.The various old workings on the Property show mineralization composed of various oxides of iron and copper minerals such chrysocolla, brochantite, copper wad and copper pitch. They generally replace primary sulphides and are found in joints, fracture fillings, disseminations, veins, semi-massive patches and coatings. Primary mineralization consists of chalcopyrite, bornite, galena and sphalerite, in veins, veinlets, and sulphide patches, often associated with quartz, carbonate, and barite, as seen in the dump material of the deeper old mines. Pyrite and magnetite are also present.
San Lorenzo predecessor companies conducted various exploration programmes as shown in the table below.
Potential for large bulk mineable copper – gold porphyry
By San Lorenzo Gold Corp.
3 LARGE ZONES
Strong copper-gold surface mineralization.