Eastern Metals (ASX:EMS) has made an announcement about a key resource.

Following the announcement shares of Eastern Metals fell 4.000% to $0.120.

Eastern Metals s pleased to announce that drill hole HDD049B, located approximately 40m beyond the existing Home of Bullion resource outline in the lower main lode, has returned very high level copper assays with significant zinc and silver credits.

This result confirms the potential to further increase the size of the Home of Bullion deposit through further resource expansion drilling.

When a mining company releases an update about a key resource it?s exciting times for shareholders.

A lot of capital goes into exploration and when a new deposit is found there?s usually a share price boost.

Discovery is the reward stage for investors, particularly of junior mining stocks, searching for undiscovered deposits of natural resources.

When discussing new resource discoveries it?s beneficial to know the difference between greenfield and brown exploration.

Greenfield exploration is looking for mineral deposits in areas that have not been explored.

In brownfield exploration deposits are being sought near or next to an already existing mine.