Abramelin, on 19 February 2013 - 09:20 AM, said:
It looks like some huaqueros did some serious digging.
And of course the locals say they don't know who did it, heh.
Hell maybe it was some rock-munching gophers that did it, lol
On a more serious side and I'm not having a stab at you MysteryBuff, but I'm trying to explain the why explosives would have been rather unlikely to be used in this case, beside's from the fact that they didn't have any as this has never been evidenced in any way.
Holes in the ground made by explosives, tend to be rather irregular, due to minute differences in the ground density and composition, amount of rocks and pebbles, etc. and even weather conditions like atmospheric pressure and humidity play an important role.
Anybody that has worked with explosives at one time or another or has directly seen their effect can agree to that.
Also, when you have explosions so close to one another, you de facto change some of the conditions for the next few charges you set, so you need to recalculate amount of explosive, depth of the hole you set the charge in, etc. It takes a lot of adjusting in the present, when we have god knows how many explosives to pick from, which are easier and more safe to handle, than black powder and not to mention more efficient.
I mean it took the Chinese a few hundred years just to adjust the formula to it's different uses, which does not account for the setting and usage of the charges, once you want to use it.
BEsides I'm unsure soil testing would have shown anything as most likely rain and weather would have washed most chem traces away.