A placer claim in the north, a crew of three, one excavator, one truck and a wash plant. You pick where to dig. They strip the overburden, dig the pay, haul it, wash it, and every few days you clean the mats and find out what you really had.
Smelt your own bars and sell them at the day's price. Buy bigger iron. Keep it running. Freeze-up ends the season on day 120.
Runs in a desktop browser. No install, no account. Your claim saves in the browser.

How it works
The tank. The claim is shown cut open, like an ant farm. The front face is glass: topsoil, silt, boulder clay, sand lenses, the brown gravel, then the pay sitting on bedrock. Where you dig, the pit goes down through them in section.
The ground keeps its secrets. You do not see gold at this scale. The tells are the lay of the layers, and the real numbers only come from a test pit, a drill hole, or a clean-up. Rich pay shows its colour only in an open face.
Nothing vanishes. Every block dug goes somewhere: overburden to a berm, pay into the truck and onto the stockpile, washed gravel to the tailings, felled trees into a windrow of logs.
Real mining, easy mode. Fuel by the litre, wages every night, iron that wears and breaks, parts in a bin, a mechanic worth hiring. Rain floods the pit below the water table until the pump catches up.
Your crew. Click a face across the top, then a thing in the world, to give the task. The excavator stands apart from the cut, takes the ground under its own tracks last, and clears the trees ahead of it.
The books. Yards moved, grams into the mats, bars poured, cash, the best day. The season ends at freeze-up and what you own carries to a bigger, richer claim.