Good call on the angle wall formation, I was planning on following that pattern myself.
I know foam is a popular material for many modelers, however there will be no foam on my layout. I am making a form out of wood and using tin foil to line the wood mold, will be pouring hydrocal into the form. I followed this technique on my previous quarry model (much smaller) and really liked the results.
I utilize hydrocal and aluminum screen and paper towels for all my terrain and rock work, along with real materials (dirt, sifted gravel, clay, stones, etc.)
Here is some of the discarded hydrocal from recent batches mixed for the hill work shown earlier:
View attachment 208437
These chips are easily broken up with a hammer and used as debris
Check it our how closely these resemble the real thing:
View attachment 208438
Early quarry scene, this area changed drastically as material was extracted.
View attachment 208439
Credits - Minnesota Historical Society and Taylor Publishing
Thanks for commenting!!! Dave LASM