Reading the article in Resource Stocks (see YTC web site), the CEO says "Even something about the third of the size of CSA would make it a large scale deposit".
CSA is owned by Glencore, so hard to get info on. The most reliable source I could find (http://minsocnsw.org.au/minsocnewsletters/History%20of%20the%20CSA%20Mine.pdf) estimates that 596,250t of metal (not ROM) has been historically mined, and, "at least" another 1mt (of metal) remains.
If Hera/Nymagee happens to be one third the size of this then they will have 560,000oz Au/eq at Hera and 500,000t contained Cu at Nymagee (not including credits from other metals and not discounting the 25,000t of historic mining).
Sandfire is currently a $1b market cap company with 565,000t contained copper (reserves & resources)and approx 630,000oz (reserves & resources).
YTC Price at posting:
70.5¢ Sentiment: Buy Disclosure: Held