In keeping with my above post which is more general here is another snippet for background reading about northern Mexico.
It is possible to get a Zn/Pb/Ag mine off the ground in Mexico by a small Aussie based company.
Comparisons are always subjective and I haven't done much research so this is just to show something that has announced and not intended as cross promotion.
This project is over 400 Kms east (direct line!) of Opasura and relatively close to one of Grupo Mexico's base metal operations at Santa Eulalia. A major difference to Opasura.
Below is a comparative timeline I posted about the two projects awhile back.
Both companies appear to be on track. AZS started much later so has a bit of catch up to do.
For those interested in this type of information check out Aztec Minerals who are hoping to emulate Arizona Mining's Taylor discovery ($1B+ to S32) with properties in the region and across the northern border.