very close you have been doing a lot of research to get that close .. yes the rock wall art of Cortez had the dates 1536-1537 in front of the picture and i assume the art was dose some time around those years . and when i search Cortez the only years he could have been in the supers was 1536 and 1537, logic tells me that those were the years he went there looking for the lost Silver mine of Tayopa .with those dates i put him within 200 ft of the mine ,and i believe the confusion came after when the mine was renamed the El sombrero after the fall of Tayopa around the years after 1603 , now i base that logic on the fat the Tayopa church was doing weddings and birth records and grave yard records ..now your most likely thinking how dose that mine if it is Tayopa how's that fit in to the Aztec and Montezuma 2 well the Aztec codex of Chicomoztoc shows the birth of Montezuma 2 in the seven caves and we also know that a native legend stated that a gold vane ran threw the front two caves of the seven caves . and that same vane is the LDM ,now this is where it get interesting , that's a very rich gold vane but yet gold and silver are often found in the same vanes . in this case the LDM vane showed up a 1/4 mile away and turn to mostly Silver that became the Tayopa Silver mine ... it is funny because Cortez was looking for Silver and walked right past the richest gold mine in the world ...Cortez had been making a lot of his wealth from buying up Silver mines down in lower Sonora and the Supers at the time were part of new Spain , Sonora , to think that Cortez didn't go into the supers would be foolish ...when Tayopa was active they did anything to keep it hidden from the ring of Spain ,even the Spanish wanted their cut .when you get a silver mine that rich they cook the books and sent about 1/2 to the king's ships and hide the rest in the tunnel , stock piled as much as they could then they made one mistake . forcing the natives to work the mines , the more greedy they got the madder the natives got till the got the chance to over throw the Spanish and then they killed the Spanish and the Jesuit and some of the Peralta family ..got away and then came back years latter trying to work the mines ,IMHO Cortez made up most of the details of the seven cities of gold was more smoke and mirrors then fact ,,,...i think Cortez was using that legend to cover his silver mines ,a lot of gold never got to the king , some ended up at the bottom of the gulf ,and some vanished ..where is it now setting in the tunnel right where it has been for the last 600 years .if we go by what is known ,Waltz knew of the tunnel but never knew where it was . ,he had to have been told by the Peralta when he took the mine from them .most likely the Peralta only knew the families legend of the tunnel and mines and most never knew where the tunnel was . that's why they never showed it to Waltz . it took me over 20 years to learn where the tunnel is ., so IMHO Waltz never knew where it was ..see i knew where the Hoya was so finding the Tunnel was still a problem till i found the LDM by accident...the tunnel is the hardest to locate ..after the Hoya was under 25ft of rock . the tunnel was almost lost for ever ...but in my case i had seen the Hoya and knew where it was even if it was gone now ...after back tracking for close to 20 years i located it ,so the over all history of the time line ties the misplaced details together and it started back in the very early time of the natives and then to the Aztecs and so on...see in my case i felt fitting the details and time line together were more important then opening the Hoya ,the tunnel or the LDM ..because if you cant prove what you found your just guessing ...