npv of karara project

First of all, is NPV the value that is going to be generated by a project?

The NPV of the karara project (before the resource upgrade) is valued at $2.25 billion.

Then how come the ARH project (with a resource of 1.16 billion tonnes and the grade is similar to GBG) is valued at $6.37 billion?

Can some one please explain?

Also what do they mean by LOM free cash flow?

Thanks