DEEPVEIN door hanhruiroc

One seam becomes an expedition.

DEEPVEIN is a mining progression game that lives in your Firefox toolbar popup. Strike the seam, fill the freight lift, ship ore and reinvest in a growing underground operation. Its animated pixel-art cross-section shows a timber headframe, mine galleries, carts and working miners.

Start with manual strikes and your first crew member. Better tools increase strike power and crew speed. A larger lift holds more ore. A refinery increases shipment value and unlocks automatic shipping, letting a staffed mine keep earning until you return.

Extend the shaft through eighteen strata and discover six minerals: coal, copper, iron, silver, sapphire and aurorite. Deeper mineral groups are harder to extract but produce larger, more valuable hauls. Production contracts offer additional coin rewards at six milestones.

At stratum twelve or deeper, choose a new expedition. Coins, crew, equipment, shaft progress and contracts restart; your discovered-mineral collection remains, and permanent research improves future digging power. Research is capped at fifty points.

Features:
- Direct play inside a 760 x 580 toolbar popup.
- Manual mining, automatic crew production and shipment controls.
- Eighteen strata and six collectible minerals.
- Four upgrade paths: tools, crew, lift capacity and refinery value.
- Six supply contracts and repeatable expeditions with permanent research.
- Local saves with a previous-save backup.
- Up to eight hours of production catch-up when reopened.
- A reduced-motion option and confirmation before resetting progress.

Mining stops when the lift cannot fit another yield unless automatic shipping is enabled. Offline catch-up uses the same capacity and production rules as live play. Nothing runs continuously in the background while the popup is closed.

No ads, paid currency, real-money purchases, account, analytics or network connection. All art, code and progression are included in the add-on.