Orex Minerals Inc V.REX

IOGC Deposit At The Chupaderos Caldera In Durango

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I'm not going to bother to fix the formatting. Look here on P1345 instead:
https://www.rodolfocorona.com/archivos/pdf/2007_Corona_Esquivel_et_al_CM_SGA.pdf

We see that a (reasonably) nearby caldera at Durango hosts an IOGC deposit. So, was the classification of Sandra-Escobar as a "caldera" a precipitating factor in the radiometric survey?


3.2.1

Cerro de Mercado (Durango).

Cerro de Mercado ore deposit is located in

the City of Durango (Dur

ango State, Mexico).

Lyons (1998) and Labarthe

et al

. (1990) indi-

cate that this deposit is

located within the Chu-

paderos Caldera, a large rhyolitic volcanic cen-

ter of Oligocene age

(30.8-30.1 Ma, Swanson

et

al.

1978). The caldera consists of a series of

units, beginning ash-flow tuffs (Aguila Forma-

tion) that filled the caldera. The last volcanic

Cacaria Formation (rhyolitic domes, intrusions,

and airfall tuffs) host th

e iron-rich bodies of

Cerro de Mercado (Lyons, 1988).