Silver processing

In 2017 MRV stated that leach heap 4 potentially contained approximately 916k oz’s of silver (http://mrvmetals.com.au/wp-content/uploads/2017/05/20170421-Heap-Leach-Stockpiles-Data.pdf). I believe the current processing is being conducted on heap 4 (I could be wrong). If the above assumptions are correct:
1. does that mean based on an approximate silver price of $22 we’re looking at revenue of $20m just for heap 4?
2. approximately how long would it take to process heap 4? I think they were planning processing 90,000 oz per month so I assume it would be till years end before moving to other heaps?
Looking forward to your comments (but not as much as I’m looking forward to silver production and an uptick in the share price)