I have a hard time understanding how the resource is calculated...

I have a hard time understanding how the resource is calculated from drilling results as I do not understand what "strike", "strike open", etc. mean. I bought CXO based off the mineral resource summary and projected financials but I'm not sure how they came up with it as I do not understand how far the mine is likely to go underground, and how they get the concentration for the resource.

Another thing I struggle with is the difference between Direct Shipping Ore and spodumene.

All help is greatly appreciated. Thank you