The Hercynian tungsten mineralisation is interpreted to be of granitic affiliation. Mineralisation occurs as quartz veins bundles within a ring-dyke model and disseminated in greissenized granitic fingers.

La Parrilla Mine is located in the southeastern part of the central Iberian zone of the Iberian Massif, also known as the Hercynian Massif, which occupies the western part of the Iberian Peninsula, composed of crystalline and metamorphic rocks from the Paleozoic. The mineralization comprises coarse-grained scheelite- bearing veins located within greywackes and slates of the “Complejo Esquisto-Grauváquico” formation, from the Precambrian- Lower Cambrian.

These rocks have been folded and fractured by the Cadomian, Hercynian (the most important), and Alpine orogenies, and have also been afected by a low-grade regional metamorphism (green shale facies). The existence of a contact metamorphism halo indicates the possible presence of a Hercynian granite batholite at depth. The geology and metallogeny of the mine have been studied in detail by Campos et al. (1995) and Gumiel and Campos (2002).

The genetic model for the mineralization of La Parrilla has been interpreted by several studies as having granitic afliation. The mineralization is presented as beams of seams from within a ring- dyke model, disseminated in granitic fngers. The mineralised veins have a NE–SW orientation and dip 30º SE, and their thickness range up to 3.95 m. The veins show good continuity, over 300 m in depth and spanning several hundred meters. Mineralization consists of scheelite, arsenopyrite, cassiterite, and in less abundance, pyrite, sphalerite, muscovite, tourmaline, and wolframite.

La Parrilla is a large, low capital, low operating cost tungsten and tin mine development located in Spain. The mine is approximately 300km southwest of Madrid and approximately 257km north of Seville, Spain.

Ore is to be mined utilising a conventional truck and shovel configuration at a strip ratio of approximately 1.35t of waste for every 1t of ore (1.35:1) averaged over the initial years of planned production.

Mined ore is to be initially dry processed at the mine site through a conventional dry crushing and screening plant, including coarse x-ray ore sorting. Advanced jig technology produces a quality preconcentrate which is ultimately concentrated by conventional gravity techniques. A tin concentrate will be produced via electrostatic separation and arsenic levels reduced to below product specifications via standard sulphide flotation techniques.

The product strategy for the La Parrilla Project will be to produce a tungsten and tin product at a ratio of ~8:1. W and its market advisors expect the La Parrilla product to price at 80% of ammonium paratungstate (APT) pricing per mtu. As La Parrilla has provided in excess of 130t to European customers thus far with excellent feedback and product support, the higher grade, minimum 66% product with trace impurities will continue to exceed customer expectations.