CAVEAT EMPTORInvesting in resource penny stocks requires a lot of due deligence and some luck.
Animal spirits will do if your looking for a quick flip. I do that sometimes myself when I smell a pump and dump.
There are industry standards for determining and reporting how much mineral is proven in an ore body. You shoud also be investigating managment's character and past record of success or failure if you plan to hold for any length of time.