Cassiar
Cassiar
A historic British Columbia jade and asbestos mining region, now closed to commercial production
Cassiar is a region in the far north-west of British Columbia, Canada, near the Yukon border, that has historically been significant for nephrite jade production. The Cassiar district produced commercially significant volumes of nephrite jade through the twentieth century, with British Columbia overall becoming the world's largest producer of nephrite jade for the international trade — particularly the Chinese market, which is the principal consumer of nephrite for ornamental and lapidary use. The town of Cassiar itself, originally established to support the Cassiar asbestos mine, was largely dismantled in the 1990s following the closure of the asbestos operations, and the surrounding district's jade production has shifted to other British Columbia operations in the Mount Ogden, Kutcho, and Polar regions.
Geological setting
The Cassiar region lies within the Cassiar Mountains and the broader Stikine terrane of north-western British Columbia. The geological setting is metamorphic, with serpentinite and altered ultramafic rocks hosting the nephrite jade. Nephrite is a tough, fine-grained variety of tremolite-actinolite amphibole, with the toughness and density that distinguishes it from the more famous jadeite jade of the Kachin region of Myanmar. Nephrite has a hardness of 6 to 6.5 and a specific gravity around 2.95 to 3.10, with the characteristic interlocking fibrous microstructure that gives the material exceptional toughness.
British Columbia nephrite is generally green to dark green in body colour, with some lighter and more saturated material from particular localities. The colour reflects the iron content of the host rock and the specific metamorphic conditions of formation.
Production history
Indigenous First Nations peoples of the Pacific Northwest used local nephrite for tools and ornaments long before European contact, with the regional jade tradition extending back several thousand years. Modern commercial nephrite mining in British Columbia developed through the twentieth century, with significant exports to the Chinese market beginning in the 1970s and 1980s. The Cassiar region was one of the principal early production areas, with several individual mines and prospects producing nephrite alongside the asbestos operations of the larger Cassiar mine.
The town of Cassiar, established to support the Cassiar Asbestos Corporation operations, reached a population of several thousand at its peak in the 1970s and 1980s. The closure of the asbestos mine in 1992, following both market collapse and growing concerns about asbestos-related health impacts, led to the dismantling of the town. Buildings were sold off and removed, and the original Cassiar townsite no longer exists as a populated community.
Jade production in the broader region has continued at smaller scale through subsequent decades, with operations in the Kutcho, Mount Ogden, and Polar nephrite districts producing material for export. British Columbia overall produces several hundred tonnes of nephrite annually, with the great majority exported to China.
Material characteristics
Cassiar and broader British Columbia nephrite is typically green to dark green, with the colour ranging from a lighter olive-green through saturated mid-greens to deep emerald-green tones. The most highly prized material approaches the saturation of fine Burmese jadeite, although nephrite's structural character — the fibrous interlocking microstructure rather than the granular interlocking of jadeite — gives it a different visual character with a slightly less translucent presentation.
The material is typically used in carved figures, bangles, beads, and ornamental pieces, with carving traditionally undertaken in Chinese workshops where the lapidary tradition for nephrite has the deepest history. Carved British Columbia nephrite reaches Chinese, Hong Kong, and Taiwan markets through the export channel, with smaller volumes reaching Western collectors and ornamental markets.
Trade context
For the international gem trade, Canadian nephrite — including Cassiar production — is a significant but specialised category, with the trade dynamics shaped principally by the Chinese consumption market. Pricing varies considerably with quality, with the finest dark-green saturated material from selected localities commanding multi-thousand-dollar-per-kilogram pricing in the rough trade, and lower-grade ornamental material at much lower prices.
In the trade
For dealers in nephrite, the Canadian production is one of the recognised origins alongside Russian (Sayan, Buriatya), Wyoming, and Taiwanese sources. Cassiar-specific attribution is less commonly available than broader Canadian or British Columbia attribution. Buyers of nephrite jewellery and ornamental pieces should attend to the carving quality, the colour and texture of the material, and any documentation of provenance, with the broader Canadian origin being a positive credential particularly in the post-asbestos-closure era when supply has shifted to other British Columbia operations.