Lone Jack Mine, Mount Baker Mining District, Whatcom County, Washington, USAi

Regional Level Types
Lone Jack Mine	Mine
Mount Baker Mining District	Mining District
Whatcom County	County
Washington	State
USA	Country

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Perched high above the Twin Lakes basin in the rugged North Cascades of Washington, the Lone Jack mine is one of the most storied gold producers in the state and arguably its premier gold–telluride locality. Discovered in 1897 by prospector Jack Post and his partners Russ Lambert and Luman Van Valkenburg, the Lone Jack quickly gained a reputation for extraordinarily rich, but erratic, gold-quartz ore.

From 1902 to 1924 the Lone Jack and its sister Lulu vein produced an estimated US$550,000 in gold (at historic prices), with about US$360,000 attributed to the Lone Jack vein alone. Modern sampling, underground mapping, and fluid-inclusion studies have since revealed a small but technically sophisticated system of mesothermal to intrusion-related gold–quartz veins, notable for their association with bismuth tellurides and fine native gold.
For mineral collectors, the Lone Jack is now best known for spectacular slabs and specimens of white quartz shot through with bronzy pyrrhotite and scattered wires, leaves, and pockets of gold, sometimes accompanied by silver-gray tellurides.

Location
The Lone Jack mine is located on the steep north slope of Bear Mountain (often called Lone Jack Mountain in older literature), just south of the international boundary and directly above the Twin Lakes basin, in the Mount Baker Mining District of northeastern Whatcom County, Washington. The patented Lone Jack and Lulu claims lie in section 22, T40N, R9E, Mount Baker meridian.
The Lone Jack adit portal is at approximately 5,300 ft (1,615 m) elevation, about 130 ft below the outcrop of the Lone Jack vein. The Lulu adit lies downslope at about 4,400 ft (1,340 m). The Whist vein crops out still lower on the precipitous face below the Lulu portal.

History of Mining
Discovery and early development (1897–1901)
On a frosty August morning in 1897, after weeks of prospecting around Twin Lakes, Jack Post followed a float train of quartz up the slope of Bear Mountain and uncovered a narrow but astonishingly rich gold-bearing vein. He and his partners staked five claims—the Lone Jack, Jennie, Sidney, Lulu and Whist—forming the core of what became the Lone Jack group.
The discovery vein, averaging 16–18 inches wide, carried milky quartz heavily shot with visible gold. Contemporary assays from select ore ran between about US$2,500 and US$3,585 per ton—a sensational figure even by the standards of the day. Early shipments of a few tons of ore to Tacoma smelters confirmed the richness, with newspaper reports remarking that never before had Whatcom County rock carried such visible wealth.
In 1898–1899 the properties passed via option to the Mt. Baker Mining Company, backed by Portland businessman Henry Hahn. Plans for a 10-stamp mill, an aerial tramway, and a full camp were drawn up, but the brutal winters and the cost of freighting heavy equipment into the high basin delayed serious development.

The Brooks–Willis era (1902–1924)
The most productive period began when Colonel Philip Brooks and his associate Carl Willis acquired control of the property in the early 1900s. Brooks and Willis completed an aerial tramway from the Lone Jack portal to a bench near West Fork Silesia Creek and built a stamp mill (ultimately with 15 stamps) around 1900. Ore from the Lone Jack vein was trammed down and processed by crushing and amalgamation on mercury-coated plates.

From 1902–1905 the Lone Jack vein alone produced on the order of US$360,000 in gold. By 1915–1917 a Lane grinding mill replaced the stamps, and attention turned increasingly to the Lulu vein, accessed by a separate adit 900 ft lower on the slope. Brooks–Willis Metals Co. erected a new 30–100 tons-per-day flotation and amalgamation mill on the slope below the Lulu portal around 1922–23, powered by a hydroelectric plant and diversion flume on West Fork Silesia Creek.

A 1923 report documented some 2,300 ft of development in the Lulu, 63 assay samples up to US$253.60 per ton, and a large stockpile of mined but unprocessed ore. As was characteristic of the mine, gold values were high in places and lean in others, with un-stoped ore in the Lulu vein estimated at US$20–25 per ton at that time.

In the winter of 1924–25 a major snow slide demolished the Lulu mill building, and large-scale operations effectively ceased. Total production from 1902 to 1924 is estimated at about US$550,000 in gold, of which US$332,583 is documented by mint receipts.

Later activity and modern work
Small crews intermittently re-entered the workings in the 1930s, especially during the Depression, when fixed gold prices and lack of other work made even modest production worthwhile. World War II Order L-208 shut down U.S. gold mining as non-essential in 1942, and the Lone Jack camp was gradually dismantled.

By the mid-1960s, the property was in the hands of the Bullene family. A famous incident in 1964 saw an Army demolition team detonate several hundred cases of deteriorated dynamite stored in the Lulu adit; the blast destroyed timbers, piping, and track but did little damage to the host rock.

In the 1980s–1990s, renewed interest led to detailed mapping and sampling by consultant A. Robert Grant, who confirmed high-grade pockets remaining in both the Lone Jack and Lulu veins and highlighted the untested potential of the Whist vein. Diversified Development Co. shipped on the order of 800 tons of ore per season to the Asarco smelter in East Helena, Montana between 1992 and 1996.

Most recently, small-scale miners have focused on selective mining of high-grade gold–telluride pockets and sale of both specimen ore and lapidary material.

Regional Geologic Setting
The Lone Jack mine lies within the western part of the North Cascades crystalline core, in the structurally complex collage of metamorphic terranes and intrusive bodies that make up this segment of the Cordilleran orogen.
Host rocks belong to the pre-Jurassic Darrington Phyllite, a black, graphitic phyllitic schist that, together with the structurally overlying Shuksan Greenschist, forms a distinctive metamorphic assemblage interpreted as subducted oceanic crust and pelagic sediments. The Darrington Phyllite in the Lone Jack cirque contains abundant lenses and stringers of exsolved quartz that formed during regional metamorphism and deformation; these are largely barren of gold.

Gold-bearing quartz veins at Lone Jack are younger than the metamorphic quartz and are probably related to Tertiary granodioritic intrusions in the vicinity of Mount Baker and the Skagit Range. Regionally, these veins fit within the broader suite of mesothermal/orogenic-style and intrusion-related gold systems associated with late stages of accretion, crustal thickening, and magmatism along the Cascades subduction margin.

Local Geology and Structure
Vein system and host rocks
The Lone Jack group comprises three main gold-bearing quartz fissure veins—Lone Jack, Lulu, and Whist—developed within the Darrington Phyllite on the steep northern face of Bear Mountain.
• Lone Jack vein – A steeply dipping quartz fissure vein exposed near the ridgetop and mined from the Lone Jack adit and upward stopes to surface. It was the richest and most productive of the three veins.
• Lulu vein – A subparallel vein system accessed by the lower Lulu adit; the Lulu was extensively explored and milled during the Brooks–Willis era and later work.
• Whist vein – An outcropping vein below the Lulu portal that remained largely unmined historically; modern drilling and sampling indicate probable grades on the order of 0.5–1.0 oz/ton Au.
The veins occupy narrow, steeply dipping fractures and shear zones cutting the phyllite, locally offset by small faults. Mapping shows the patented claims trending roughly northwest-southeast along the north face of Bear Mountain, with the veins roughly parallel to regional foliation but cutting across the abundance of barren metamorphic quartz stringers.

Hydrothermal conditions
A study in the 1980s documented fluid inclusions in vein quartz with homogenization temperatures around 285°C and salinities near 3 wt.% NaCl equivalent, at estimated pressures of roughly 625 bars. These data indicate a moderately deep, mesothermal environment, with gold likely transported in reduced, sulfur-bearing hydrothermal fluids as Au(HS)₂⁻ complexes.
The veins likely formed from a relatively dilute, CO₂-bearing fluid that boiled and precipitated gold and tellurides as it rose into the fracture system, consistent with a late-magmatic or metamorphic hydrothermal origin in an active orogenic belt.

Mine Workings
The mine layout reflects the steep topography and limited seasonal access:
• Lone Jack adit – Driven at 5,300 ft elevation, this adit trends roughly N 75° E for about 400 ft. About 310 ft from the portal an ore chute and manway rise 65 ft to a sublevel, from which several raises connect to the Lone Jack vein. The vein was stoped from this level to the surface along about 350 ft of strike before being terminated by faults; no deeper levels were developed.
• Lulu adit – The Lulu adit, at 4,400 ft elevation, extends about 680 ft westward into the mountain, with crosscuts and raises. A raise 460 ft from the portal climbs to a transfer level on the Lulu vein, which was then stoped for roughly 200 ft along strike and 80–120 ft along dip. Portions of the Lulu stope daylight on the cliff above the portal.
• Mills and tramways – A 15-stamp mill (later with a Lane grinding mill) was built 2,800 ft below the Lone Jack portal and fed by a 50-ton aerial tramway. Later, a combined flotation–amalgamation mill of about 30–100 tons per day was erected just below the Lulu portal, also supplied by tram and powered by a hydroelectric plant on Silesia Creek. Both mills were ultimately destroyed by fire or avalanche, and no significant tailing piles are evident today.

Ore Mineralogy and Paragenesis
Vein quartz and sulfides
The ore at Lone Jack is overwhelmingly quartz: the veins consist of more than 98% quartz by volume, with the remaining 2% composed of sulfides, sulfosalts, and native gold and tellurides.
Primary ore minerals include:
• Quartz – Milky to translucent white, commonly in massive or comb-textured veins. Early metamorphic quartz lenses in the phyllite are barren; later, gold-bearing hydrothermal quartz is typically coarser and cleaner, locally forming open-space fillings.
• Pyrrhotite – Bronze to steel-gray, often in massive lenses or streaks along the vein, and the dominant sulfide. In hand specimens and slabs it forms striking linear and branching patterns.
• Pyrite – Present but subordinate to pyrrhotite; occurs as fine disseminations and small cubes or aggregates.
• Chalcopyrite – Minor, as yellow metallic grains intergrown with pyrrhotite and quartz.
Sampling in the 1980s confirmed abundant pyrrhotite and pyrite, with gold concentrated in localized shoots and pockets rather than uniformly distributed in the veins.
Native gold and tellurides
Gold occurs in two principal modes:
1. Native gold – Bright yellow free gold as grains, wires, and small plates in quartz, commonly perched on or adjacent to pyrrhotite and telluride masses. In polished sections, gold is seen as inclusions in late quartz and locally along fractures.
2. Gold in tellurides and bismuth tellurides – Silver-gray, metallic platy grains and aggregates occur in close association with gold, identified petrographically as tellurobismuthite (Bi₂Te₃); these commonly host or border microscopic gold inclusions.
Modern miners and collectors at Lone Jack frequently refer to the silvery gold-bearing tellurides as “calaverite,” and experimental roasting and density calculations suggest high gold contents consistent with gold–telluride compositions.
In general, gold is most abundant where coarse pyrrhotite and tellurides are concentrated, with many vein segments essentially barren a few feet away—exactly the “spotty” distribution that plagued historic mining. Sampling has showed values between 0.01 and 2.41 oz/ton Au in Lone Jack stopes and 0.02 to 1.3 oz/ton from the Lulu, confirming extreme grade variability.
Paragenetic sequence
Although no full paragenetic diagram has been published for Lone Jack, studies suggest a broadly two-stage sequence:
1. Early stage – Deposition of massive quartz with disseminated pyrrhotite and minor pyrite and chalcopyrite, filling fracture-controlled veins in Darrington Phyllite.
2. Late stage – Continued quartz deposition with localized introduction of tellurobismuthite and precipitation of native gold as the hydrothermal fluid boiled and cooled, possibly with minor re-opening of fractures.
Later supergene modification is minimal due to the cold alpine climate and relatively fresh exposures; oxidation halos around sulfides are limited, and most specimens show pristine metallic luster.

The Lone Jack Mine as a Mineral Locality
Characteristic specimens
Classic Lone Jack specimens are compact pieces of milky white quartz containing streaks, lenses, or flame-like tongues of bronzy pyrrhotite and occasional brassy pyrite, with scattered native gold visible on broken surfaces or within vugs.
Modern collector material from the Lulu and Lone Jack stopes can be divided into several aesthetic types:
• “Lightning” slabs – Cut and polished slabs of quartz in which dark pyrrhotite forms branching, high-contrast patterns reminiscent of lightning bolts, sometimes with tiny specks of gold visible against the quartz.
• Gold-rich pockets – Small, high-grade pieces in which gold is visible to the naked eye as leaves and tiny wires along cracks or in open spaces, commonly surrounded by gray tellurides and pyrrhotite. Some specimens show multiple generations of gold, including thin films along fractures.
• Telluride ore – Dense, silver-gray ore where bismuth tellurides and likely gold tellurides form substantial portions of the metallic mass; in polished sections these can be quite striking, with sharp boundaries between quartz, sulfide, and telluride domains.
The mine is a superb source of scientifically valuable gold–telluride ore specimens and visually distinctive pyrrhotite-quartz slabs.

Grades and specimen potential
Historic mine engineers consistently remarked on the irregularity of the ore. A 1923 report on the Lulu vein noted that assays ranged from sub-economic to more than US$250/ton and that all standing pillars were “pay ore.” Later work showed that with proper grinding and flotation, up to ~97% of the gold could be recovered from typical ore.
For collectors, this means that many pieces of visually attractive ore also carry substantial contained gold, and pocket-mining the richest shoots can yield both specimens and smeltable concentrates. Modern experiments roasting and leaching Lone Jack telluride ore have documented visible “gold sponge” formed by decomposing tellurides, while emphasizing that the scientific and aesthetic value of such specimens often exceeds their bullion value.

Significance
The Lone Jack mine is significant on several fronts:
• Geologically, it is a textbook example of small but high-grade mesothermal/intrusion-related gold–quartz veins developed within a subducted, metamorphosed oceanic terrane in a continental margin orogen, with well-documented fluid inclusion and mineralogical data.
• Historically, it was the “king” of the Mount Baker Mining District, anchoring a regional gold rush and leaving a deep imprint on the cultural memory of Whatcom County.
• Mineralogically, it offers a rare combination of native gold, bismuth tellurides, and gold–telluride minerals in a rugged alpine setting, providing valuable comparative data for telluride systems worldwide.
• For collectors and lapidarists, Lone Jack’s “lightning” pyrrhotite–quartz ore is distinctive, attractive, and genuinely rooted in the mine’s geologic character rather than in artificial enhancement.
In many ways, the Lone Jack mine encapsulates the story of hard-rock gold in the Cascades: a small but fiercely contested vein of precious metal in an unforgiving landscape, worked repeatedly by generations of miners and, today, by a new generation of collectors and craftspeople who find value in both the gold and the rock that hosts it.

Mineral List

7 valid minerals.

Rock Types Recorded