How rare are +1 mllion oz deposits? You beat me to the link, Naimarantz......
There are 439 x 1,000,000 oz AU deposits world wide. at least according to the Visual Capitalist
https://www.nrh.co.il/i/pdf/NRH_Research_2012%20World_Gold_Deposits.pdf
2012 Result Summary
From an initial list of 1,896 companies we were able to identify 212 entities (Public, Private and Government Sponsored Corporations) that own 439 gold deposits hosting over 1,000,000 ounces in all categories representing a total of 3,015,542,164 ounces of gold. The complete list can be found at the end of this report.
Summary of Findings:
Total Mines & Deposits in over 1 million ounces in-situ: 439
Total In-Situ Ounces: 3,015,542,164 Total Tonnage & Grade of Database: 113.9 Billion Tonnes @ .82 g/t
Total In-Situ Ounces & Avg. Grade Producing Mines: 1,556,265,676 oz. @ 1.06 g/t
Total In-Situ Ounces & Avg. Grade Undeveloped Deposits: 1,459,276,488 oz. @ .66 g/t