Not entirely sure.

This was the latest "assessment" that I was able to find at SSO's web-site:

http://ir.silverstandard.com/releasedetail.cfm?ReleaseID=506814

Note that there have been several holes reported on since this that indicate some expansion of the total amount.

Not sure if these are M & I (probably) or other category...

Note the totals: (all in millions)

Gold: 18.9 oz

Silver: 112.3 oz

Copper: 1,203 lbs

Molybdenum: 99 lbs

Rhenium: 243 kgs

Huge amount of resources..

Downside - at least one of them - remote location and large capex to start mine.