ikane92...You're well on your way now with DD already! Good Luck, you are going to find plenty of information out there now, one site leads to another and another. Unlike Butte, Nevada/South Eureka(Timberlines FLAGSHIP), is NI 43-101 compliant. There is already approx. 500,000 ounces proved up and expanding. You can find historic mining information on Butte and South Eureka, trust your instinct. You know what they say, one of the best places to find gold is where it has been mined/discovered already!
ikane92...Estimates only, since Butte is not operational YET! Development costs were approx. 24 million. I have seen Operational estimates ranging from $350.00-$600.00 an ounce. Timberline states it... well below $1000.00! Google Ian Cassel, he appears to be a well informed analyst with plenty of information on Timberline available. Hope this helps you get started!