From 2007 – 2010, Tamaya Resources Limited, undertook a feasibility study and constructed a plant and commenced mining for a short time. Tamaya Resources targeted Cinabrio Norte with a very limited shallow drilling effort in 2008.  In 2010, Glencore International Plc acquired the project, finished allocating needed capital, including upgrading plant and the underground development, then resumed operations at Cinabrio.  Glencore then sold the project, in late 2018, to Xiana Mining. In 2018, Xiana Mining Inc. increased exploration efforts and initial development of the San Andres target. In 2020, Xiana completed a limited follow-up drill program at Cinabrio Norte. Historic hole CNS-20-01 drilled was drilled completely within the target stratigraphic unit resulting in multiple mineralized intercepts and, most importantly, confirmed the presence of the target unit for over 200m of strike length with anomalous copper sulphide mineralization.  The target stratigraphic unit has been mapped along a north-south strike from the Cinabrio mine for 400m.

Cinabrio Norte is an Iron Oxide Copper Gold (IOCG) type manto deposit. 

Mineralization at Cinabrio Norte has a continuous strike length of about 400m, is up to 30m thick and has been drill traced to a depth of around 350m. The mineralization is predominantly chalcopyrite with minor bornite and pyrite, dips steeply to the east and is occasionally locally faulted with small offsets. 

The regional geology of Jurassic to lower Cretaceous age consists of a sequence of volcanic rocks (lavas, conglomerates and andesitic breccias) with marine sediment collations (shales, fossiliferous limestones and thin layers of sandstones). This sequence is affected by a granitic intrusive (diorites, granodiorites) of Upper Cretaceous age.

The manto mineralization is hosted by a regionally extensive marine sedimentary rock unit within an andesitic volcanic sequence. The sedimentary rock unit is comprised of dark coloured shales, volcanoclastic sandstones, volcanoclastic sedimentary breccias and conglomerates and fossiliferous limestones.

The structural framework of the district is represented by stress and compression forces, which is reflected in north-south, northwest, and east-west tectonic orientations. The structural fabric of the regional and district character controls the location of copper mineralization. The mineralized sedimentary unit is deformed and rotated by extensional faulting resulting in multiple structural repetitions of the mineralized sedimentary unit exposed at surface. The stratigraphy has been consistently rotated to the east resulting in a north-south striking and east dipping sequence. 

Mineralization is variable and believed to be controlled by mineralizing fluids focused along structures within the footwall rocks. Syngenetic pyrite is a common constituent of the sedimentary unit.

Hanging wall alteration is sometimes absent but can reach up to 30 metres thick above the mineralized sequence. There are three types of hanging wall alteration which is sometimes pervasive in the sedimentary sequence.

    • Silicification and sericite alteration 
    • Silicification with potassic alteration including epidote and specularite 
    • Silicification and sericite alteration with strong tourmaline alteration 

In the feeder/stringer zones in the basal andesitic sequence, copper mineralization is comprised mostly of bornite associated with potassic alteration, silicification and occasional epidote. These feeder structures appear to be part of a structural network that also caused the initial depressions that were filled with the chemically favourable host sequence. They were later reactivated during compression that forced metal bearing fluids into the sequence along these structures.

At Cinabrio Norte, the Phase 1 drill program consisted of 53 holes with a total of 13,731 meters drilled as a series of step-out holes to test the target stratigraphic unit along a 400m strike (north-south) to a depth below surface (“down-dip”) of 350m. The current drilling has outlined a significant zone of high-grade mineralization in the northern portion of the target zone which remains open at depth. Once permitting and detailed mine design are completed, the Cinabrio Norte zone could be accessed for mining of copper ore by completing minimal amounts of underground development owing to Cinabrio Norte’s proximity to Cinabrio -  only ~110m north of the 220m level in the Cinabrio mine. The Cinabrio Norte zone remains open at depth, which BMR plans to investigate via underground drilling once access has been established.