There are a few factors you can use. The mill is rated for 700 tons a day. Of course, that is full speed with no problems and non-stop ore.
Search through the old PR's for the historic numbers for the mines. Core samples might give a more accurate number, but I'm not sure how that is coming since the Gold King project was nixed.
I'll see what I can dig up tonight. iPhones are good, but not great for this type of thing. Don't trade in your laptop for one.