REX Well Aware Of Importance Of Basal ConglomerateI have been unable to locate an isopach map showing the extent of the "Manto Rico" basal conglomerate. We know it is of prime importance at La Pitarrilla. And from the Coneto 43-101, dated 2009, we see clearly that it plays a role there, as well. From P16, here:
https://www.orexminerals.com/i/pdf/Coneto-NI-43-101_Technical_Report_2009.pdf
"In the region extending north of the city of Durango, metasedimentary rocks of Cretaceous age are exposed in small windows through the Tertiary volcanic rock cover. These consist of mudstone, shale, limestone, and polylithic conglomerate with volcanic, sedimentary and limestone clasts. While conglomerates are not widely exposed, they have been shown to be an important unit below such mining camps as La Preciosa (Whiting, 2008; Whiting and Gunning, 2007) and La Pitarrilla (McCrea, 2007)"
And from P20
"The geological setting of the host rocks at both La Pitarrilla and La Preciosa consists of a Cretaceous age sedimentary sequence at depth, with permeable conglomerate units at an unconformity with overlying Tertiary aged andesite of the Lower Volcanic Group."
So we can see that all of Cope's previous properties, both from Orko and from Orex, rely upon the permeable basal conglomerate to some degree. And REX also knows this is an important factor at La Pitarrilla.
Now consider that Coneto, La Preciosa, and La Pitarrilla form a roughly triangular pattern with Sandra-Escobar, spaced between 50 - 75 kilometers. Sandra-Escobar is located a bit further to the west, within this pattern. Does the basal conglomerate extend far enough to the west, to be significant at Sandra-Escobar?
If anyone out there has a map showing the extent of the basal conglomerate, please post it here.