MineArchiveMine Base
Fictional record. This page describes a mine from a fictional setting, not a real place. Information is based on the cited canon, with adaptations and interpretation distinguished where necessary. It is kept separate from the real MineArchive corpus — see Fictional.
| Setting | Metal Gear Solid |
|---|---|
| Location | Costa Rica, roughly 15 miles north of Central Heredia, near the Costa Rica/Nicaragua border, in the early 1970s setting of Metal Gear Solid: Peace Walker. |
| Type | Gold mine, in truth a facade over a covert weapons-assembly facility |
| Worked | Operated by Peace Sentinel (Hot Coldman's private forces) from the early 1970s |
| Status | Researched |
Overview
A gold-mining operation in Costa Rica in Metal Gear Solid: Peace Walker that is, in truth, a front concealing the assembly of Peace Walker, the game's titular AI-controlled nuclear weapons platform, deep within its lowest level.
History
Mine Base presents itself as a gold-mining and quarrying operation run by Peace Sentinel, the private military force led by Hot Coldman, in Costa Rica in the early 1970s. Barracks, watchtowers, sheds and construction equipment around the open mining pit maintain the appearance of an ordinary extraction site. In truth, the mine's real purpose is concealed in its deepest chambers: hangars housing mass-produced AI weapon prototypes (Chrysalis, Cocoon and Pupa), a command post, a prison, and — in the very lowest area of the mine — the assembly hangar for Peace Walker itself, the AI-controlled nuclear weapons platform at the centre of the game's plot.
Workings
An open mining pit with the base's military infrastructure built into and around it — barracks, watchtowers and equipment sheds maintain the gold-mining cover story on the surface, while the actual weapons-assembly facilities are built into the mine's lower, deeper levels.
What became of it
Fictional — set within Metal Gear Solid: Peace Walker's early-1970s storyline; not referenced as still active in later games.
Canon & adaptations
Sourced entirely from Metal Gear Solid: Peace Walker (2010); no other game or adaptation depicts this location.
Related fictional records
Recorded claims
Each claim is marked with its basis — explicit canon, MineArchive inference, adaptation only, or fandom interpretation — and attached to the source(s) below. Where tellings disagree, both are kept.
- Mine Base outwardly operates as a gold-mining and quarrying site run by Peace Sentinel, with barracks, watchtowers and equipment maintaining the appearance of ordinary extraction. (fandom interpretation) 1
- The mine's real purpose is concealed in its lower levels: hangars for mass-produced AI weapon prototypes, a command post, a prison, and — in the deepest area — the assembly hangar for Peace Walker itself. (fandom interpretation) 1
Sources
- (interpretation) Mine Base — Metal Gear Wiki — Fandom
Record created: 30 August 2026 · Last researched: 2 September 2026