Awesome, I believe you’ve found the mother load. As far as left overs go.
Me, I’d take those piles down layer by later.
You said you found speckled ore. Crush it all. It adds up. Sounds like the tellurides in Colorado.
After you get that all cleaned up. I’d work every direction for at least five hundred feet. Especially down hill of the mine for material that got away. Look for their trails, could’ve dropped high grade on their way out. Dropped a bag or two, busted open. Who knows. I would most certainly at least work parallel to existing mine. You may find an unseen stringer or vein just below the ground.
Seriously, if your the first to be there since the miners left. I’d work the poop outta it.
Good Luck. And enjoy!!!
Terry