Endless copper mine economy
As i keep accumulating gems from my pits (started with 1 pit a while back, on my last available pit to be purchased soon) i started thinking where to spend my cash. I thought maybe a an endless copper mine?
Here's the simple calculation: if i just sold my gems (at 20gc per gem as is effortlessly doable - take special gold mine for example) i would be able to buy 10,000,000 of copper ore. To manufacture 10m of ore (with - to make it easy and generous - the following assumptions: fast lvl5 mine with 100 sec cycle, buffed for free for 50% of the total time) it takes OVER 4 YEARS.