The Jackman Mine: A Symbol of Buried Secrets in Extinction

What the Jackman Mine Literally Is

The Jackman Mine is an abandoned nineteenth-century hard-rock gold and silver mine located deep in the Colorado mountains, adjacent to the luxury Erebus Resort. It is one of three interconnected mining claims—Jackman, Hesperus, and Fryingpan—that together form the largest hard-rock mine complex in the state. The mine tunnels were blasted into what prospector Augustus Yearwood calls the Cronus Pluton, a quartz-rich granitoid formation that forced miners to extract vast quantities of rock to follow scattered ore veins. Over decades, the three claims physically linked up underground, creating a vast, unmapped labyrinth of stopes, shafts, and adits. Yearwood describes chambers large enough to hold Notre Dame, yet so stable that little shoring was needed.

The mine lies on land now owned by Erebus, but its existence was omitted from official briefings given to law enforcement. Sheriff James Colcord first learns of it from historical-society volunteer Burch Burchard, who reports that the Jackman Mine’s maps were recently stolen—copied earlier by Erebus staff, then removed within the past few months. Colcord later obtains hand-drawn maps from Yearwood, who remembers every adit and ore body. The mine’s primary access tunnel is sealed, but a minor adit in Hookers Canyon remains open, discovered by Cash and Colcord after they follow a cannibalism scene up the couloir.

As the investigation deepens, the team enters the mine and finds fresh shoe prints, a throbbing drumbeat, and evidence that the killers have been moving through the tunnels. Ultimately, they discover that the Jackman Mine connects directly to the locked steel doors of the Erebus laboratory complex—the secret facility where genetically engineered Neanderthals were created and held. The mine thus serves as a physical and metaphorical passage between the curated wilderness above and the unethical science below.

Where the Jackman Mine Recurs and How Its Meaning Evolves

The Jackman Mine first appears offstage in Chapter 18, when Colcord visits the historical society and learns of its existence—and that its maps have been stolen. At this point, the mine is merely a curious omission: why did Maximilian, Erebus’s security director, never mention it? The question hints at institutional concealment.

In Chapter 21, Yearwood gives Colcord a detailed geological and historical account of the mine. He calls it “the biggest hard-rock mine in Colorado” and emphasizes that all three mines eventually linked underground. This transforms the mine from a forgotten relic into a potential hideout for the killers—a vast, uncharted space where anyone could disappear.

In Chapter 35, after finding the ritual cannibalism site, Colcord realizes the couloir above Hookers Canyon leads to a Jackman Mine adit. Cash decides to enter immediately, a choice that shifts the mine from mere possibility to active danger. Inside, they find the fresh shoe print—the first concrete sign of recent occupation. The mine becomes a crime scene.

In Chapter 36, the team hears drumming and sees moving lights in the darkness, both ahead and behind. The mine is now a trap. Later, in Chapter 39, Cash’s squad crawls through a tight passage and discovers a polished stainless steel door—the hidden entrance to the Erebus labs. The mine’s meaning deepens: it is not just a hiding place but a secret highway linking the surface resort to the underground laboratory where de-extinction experiments took place.

By Chapter 40, Colcord leads a SWAT team through the mine only to find no trace of the killers—but they discover two woven ornamental balls hanging from an ore crusher, later found to contain victims’ eyeballs. The mine becomes a gallery of terror, a place where the killers display trophies.

Finally, in Chapter 48, Cash and her team use the mine to execute a no-knock warrant, cutting through the steel door with an acetylene torch. The mine is now the staging ground for the climactic raid. In the end, after the Neander revolt and power failure, Marius Karman uses the mine to attempt escape, and the facility’s connection to the outside world is severed. The Jackman Mine has evolved from an overlooked historical artifact to a corrupt artery of a criminal operation, and ultimately to the last escape route.

Character Connections to the Mine

Sheriff James Colcord is the character most associated with the Jackman Mine. He discovers its existence, tracks down the maps, and pushes for its exploration. The mine represents his investigative intuition: he trusts an old prospector over the official story. His growing suspicion of Erebus—why would they hide the mine?—animates his determination. In Chapter 40, as he searches the empty tunnels, he reflects on his own fitness and on Cash’s past, linking the mine’s emptiness to his own anxieties.

Agent Frankie Cash enters the mine despite her claustrophobia, showing her willingness to risk personal discomfort for the case. The mine tests her resolve and forces her to defy her boss McFaul. For Cash, the mine is a place of professional and ethical reckoning: she must decide whether to break through the steel door without a warrant, and later she leads the team through the darkness with only a phone map.

Marius Karman, the lead geneticist, uses the Jackman Mine as his escape route when the Neander revolt begins. For him, the mine is a familiar back door, a reminder that the entire Erebus project was built on concealment. His final journey through the tunnels represents the collapse of the whole unethical enterprise.

The killers—later revealed to be the defective Neanderthals—use the mine as their lair and staging ground. They leave gruesome signs inside: the shoe prints, the drumming, the eyeball ornaments. The mine becomes an extension of their savage intelligence, a maze they control.

Internal link: Frances Cash Internal link: James Colcord Internal link: Marius Karman Internal link: Maitland Barrow

Theme Connections

The Jackman Mine crystallizes several major themes in Extinction.

De-extinction and its consequences – The mine physically connects the visible world of the Erebus resort to the hidden laboratory where Neanderthals were cloned. It literalizes the idea that de-extinction cannot be contained; its effects burrow into the landscape, emerging where least expected.

Technological hubris and playing god – Erebus’s owners believed they could seal the mine and forget it. But the old tunnels proved impossible to completely close, just as the genetic manipulations could not be kept under control. The mine is a monument to the arrogance of assuming technology can erase the past.

Institutional corruption and cover-up – Maximilian never disclosed the Jackman Mine; the maps were stolen; Barrow deflects questions. The mine stands for everything Erebus tried to hide: the true scale of its operations, the ethical transgressions, and the evidence of murder.

Survival and extinction as natural forces – The mine, a remnant of a failed gold rush, has been reclaimed by mountain silence. Yet it now hosts a new form of life—the Neanderthals—who are fighting for survival. The mine becomes a dark womb from which a new (or old) species emerges, threatening the extinctions of others.

The limits of human empathy – Cash and Colcord see the cannibalism trophies inside the mine and struggle to comprehend the killers’ mindset. The mine forces them to confront the possibility that some creature—human or otherwise—lies beyond the reach of moral understanding.

Internal link: De-extinction and its consequences Internal link: Technological hubris and playing god Internal link: Institutional corruption and cover-up Internal link: Survival and extinction as natural forces Internal link: The limits of human empathy

Four Study Questions with Answers

1. Why does the stolen map of the Jackman Mine serve as the first clue that Erebus is hiding something?

The stolen map signals deliberate concealment. Colcord learns that Erebus staff copied all mine maps years ago, but the originals of the Jackman Mine were removed only a few months prior—just as the murders began. Maximilian never mentioned the mine in any briefing. By hiding not only the map but the very existence of the mine from investigators, Erebus reveals it has something to hide within those tunnels. The theft also shows that someone with knowledge of the mine’s significance wanted to prevent law enforcement from exploring it, directly tying the mine to the criminal operation.

2. How does the mine’s geography reflect the ethical structure of Erebus Resort?

The Jackman Mine literally underlies the resort’s polished surface. While guests above see curated wilderness and luxury accommodations, the tunnels below house a laboratory where de-extinct Neanderthals are created, held, and ultimately exploited. The vertical relationship—luxury on top, exploitation below—mirrors the hierarchy in which profit and spectacle rest on hidden ethical violations. When Cash and Colcord cut through the steel door, they breach the boundary between the visible and the hidden, collapsing that hierarchy.

3. In what way does the mine function as a trap for both the killers and the investigators?

For the killers, the mine offers concealment and freedom of movement through its interconnected tunnels. But it also confines them underground when the power fails and steel doors lock automatically. For Cash’s team, the mine is a trap because the Neanderthals know its geography intimately, laying ambushes and leaving decoys. The shoe print and the drumming lure the investigators deeper, and the killers can appear from multiple directions. The mine becomes a shared prison where both hunter and hunted are at risk.

4. What does the discovery of the eyeball ornaments hanging in the mine suggest about the killers’ psychology?

The ornaments, woven from grass and twigs and containing the guard Johnson’s eyeballs, indicate ritualistic behavior linked to surveillance. The killers are mocking the investigation: they see their victims and the law enforcement agents who pursue them. The placement at an ore crusher—a machine that breaks rocks, not bodies—creates a grotesque fusion of mining and murder. The ornaments also suggest a belief in symbolic power: the eyes watch the searchers, perhaps as totems meant to intimidate or claim territory. The killers are not simply hungry or crazy; they are theatrical and deliberate, using the mine as a stage for their terror.

Visit the Extinction book page for an overview of the novel.