Geology and Reserves

The outcropping materials in the area are arranged in a large tectonic structure called the La Codosera syncline and are made up of schists and phyllites, interspersed among which is a swarm of large diabase sills, folded during the Variscan orogeny and they are found following, roughly, the stratigraphic arrangement (E-W) of the schist materials among which they are arranged.

Diabase are subvolcanic femic rocks that outcrop in the form of sills whose primary mineralogical components are strongly transformed. They present basaltic composition and the existence of large amphiboles crystals that include much smaller plagioclase crystals are characteristic.

Within the mining rights, it has been possible to verify the existence of several sills* with a subvertical disposition. Only those with a depth greater than 50 m have been considered. Three (3) have been located that meet these premises, and their dimensions vary between 1,500 meters to 1,900 meters in length, with a width that oscillates between 85 and 100 meters.

*Sills are intrusive igneous rocks that originate when magma or mineralized hydrothermal fluids make their way to the surface through irregularly drawn fissures or flat-edged cracks and faults and solidify inside forming veins, masses of tabular contour rock.

Sills within the mining rights area

Sill A: Located in the southernmost part of the concession. It occurs in the form of a large reef body with a direction N90º110ºE, subvertical arrangement and with outcrop dimensions of 1,500 m long and >100 m wide. It outcrops in the form of isolated patches heavily covered by reddish alteration lands, with abundant boulders included in it.

Sill B: It is in the center of the mining domain. Like the previous one, it appears in the form of a large body of veins heading N80º90ºE, subvertical, and with outcrop dimensions of 1,900 m long and 90-100 m wide.

Sill C: It is located approximately 100 m to the north of the previous one. It presents a subvertical arrangement and an elongated shape in the N80º100ºE direction, with outcrop dimensions of 1,500 m long and 85-95 m wide.

Sill D: Located in the northernmost part, it has a subvertical arrangement, a N90º110ºE direction, and outcrop dimensions of 1,500 m long and >100 m wide.

The depth considered for its extraction has been taken at 140 meters. Below this height, and in case the water table* does not hinder the work, the exploitation could continue, since the sills continue downwards, not knowing the total depth they reach.

*Water table: accumulation of groundwater that is located at a relatively small depth below ground level.

Proven Reserves

Diabase

Depth	40	m.
Length	6,400	m.
Width	75	m.
Volume	19,200,000	m3
Density	3.01	gr/cm3
Total Proven Reserves	57,792,000	ton

Probable Reserves

Diabase

Depth	100	m.
Length	6,400	m.
Width	75	m.
Volume	48,000,000	m3
Density	3.01	gr/cm3
Total Proven Reserves	144,480,000	ton