Would also be a good thing (beneficial for Pakistan I would assume) if Pakistani mining firms and companies were involved within KSA as well. I don't believe that there would be any hindrances in that regard, rather the opposite.
KSA as a whole is opening up for foreign investment and investors.
A good example that I know for a fact that many Muslims from across the world (West and East, very wealthy and less wealthy) will try to take advantage of in one way or another.
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As the Kingdom opens to the world for business, business setup for foreigners is welcomed in the Kingdom including options with 100% foreign ownership.
www.setupinsaudi.com
Nowadays there is very little difference between Western world and KSA in terms of abilities for foreigners to gain foothold.
Even in terms of citizenship which not long ago even Saudi Arabian mothers could not transfer to their children if married with non-Saudi Arabians. Nowadays there is a pathway for certain individuals, such as highly skilled professionals and foreigners, although the core requirements remain strict for naturalization. If I recall a 10-year residency, fluent Arabic, good moral conduct, a stable financial status, and a demonstrated contribution to Saudi Arabian society. But at least the option is there nowadays and I expect it to increase in the future.