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Subseries consists of photographic material pertaining to early geological exploration and planning of the mine sites, plant sites and town sites of both Cassiar, B.C. and later Clinton Creek, Y.T. This subseries also includes photographic material capturing mining locations not owned by Cassiar Asbestos Corporation for what is believed to be corporate research and development purposes.

Six metal storage cases containing primarily slides depicting drill core sections in wooden storage trays. Cases contain inventories of slide images as well as annotations which document the year, drill hole number, and the length along the drill hole from which core sections are taken. In addition to the documentation of drill core sections, the cases contain slides depicting the following subjects: “Representative samples” of drill core fragments, drill core fragments in perspective, “physical characteristics” of the drill cores and the storage trays, the pit mine, a worker in a plaid shirt, close up shots of the geology of the working face, and images annotated “SHOTS OF JADE BOULDER CORE J5-J1”. Five slides originally filed separately and stamp dated “Jul. ‘73” depict what is speculated to be employees working on the diamond drilling project include 2 images annotated ‘R. Dickin Aug ‘72’, ‘I. Oliver Aug ‘73’, ‘S. Zimmer Aug ‘73’, and ‘core shack ’73’. The cases contain 234 7x7cm slides and at least 8 5x5 cm slides which are duplicates of the remaining images. The file also contains a slide strip containing several 7x7 cm slide images.

The file contains eight photographs depicting close up images of three rock samples, some photographed with a ruler for scale. One of the rock samples is speculated to be obsidian and the other two are likely serpentine. The images where originally found in an envelope titled "ROCKS" and are likely dated around 1991.

Included in this file are an five photographs of rocks on a shelf, which may be asbestos sample rocks. There are five accompanying negatives to these photographs and are likely dated around 1977. The photographs and negatives were found in an envelope labelled "Negatives - CIMM Photos."

Additionally two negative strips of geology maps of Canada. These negatives were found in an envelope labelled "Negatives - CIMM Papers, Mining, Planning, Geology."

Photograph of outside of dry rock storage building in Nordenham Germany. Part of Visitation Report.

Photograph of bagging rams inside Nordenham Finishing Mill in Germany. Part of trip report.

Photograph of dust collect bays, with unidentified man in background, at Nordenham Finishing Mill in Germany. Part of trip report.

Photograph of cyclone blockage detector at Nordenham Finishing Mill in Germany. Part of trip report.

Photograph of plastic inserts at Nordenham Finishing Mill in Germany. Part of trip report.

Photographs from Cassiar trip report to R.C. quarry plant in Sweden. This plant utilized rubber type dust enclosures to maintain low dust levels. Labelled Appendix F, this collection includes: landscape photograph of quarry, seal to conveyor gallery, rubber lined truck, rubber seal on equipment, rubber cover screen, and rubber bucket elevator.

This collection of photograph is a Cassiar trip report to Weldotron Inc. Industrial Packaging Systems in Piscataway, New Jersey to look at the shrink wrap system. The ten photographs depict the wrap applicator, bag maker placer, feed side of wrap applicator, shroud wrap machine, and before and after packaged asbestos. One photograph is of the Kellogg Plant in Michigan depicting forklifts. There is also a commercial photograph of the "Weldotron Pallet Pak Shrouder & Shrink Tunnel for shrink wrapping pallet loads."

This is a collection of photographs from Liverpoool UK for the commercial promotion of a barrel. They are professional depictions of all sides and angles of the proposed barrel that Cassiar was exploring to obtain. It can be assumed that this barrel would have been used in the powerhouse as the original file was titled Powerhouse and contained powerhouse records for development.

This is a collection of photographs from a Trip Report to Eureka Asbestos Cement Plant in Mexico by A.C. Beguin, General Superintendent, in 1958. It was primarily a "contact" visit by Cassiar Co. to the Mexican plant as they were new customers.

The photographs depict various in and around the plant, including: suburbs around plant, entrance to plant, Mexican people making "tortilla," discussions with General Manager Sr. Batis and plant engineer Sr. Gomez, Cassiar fibre reading for blending, weighing and batching area, sludge tank, pipe machine , pipe storage, hammer mill, dust tube filter, sheets going through sizing, shipments, construction of a water storage tank, workmen at work, tank area, loading trucks, testing machine, and final percentages of fibre in products.

One man can be seen on crusher building framework, unidentified equipment and long metal rods in foreground. Power lines, a large tank, and other small buildings are semi-visible on a level in the mountainside just above the crusher building. Sky can be seen in background.

Photograph depicts a round bucket attached to the main hook line of a crane and suspended over building framework in crusher construction site (crane not visible in image). Men stand around the bucket on high level of crusher building. A dirt road and long building believed to be housing conveyor "B" can be seen in background.

Men can be seen working on site. Crusher building in midground, chutes can be seen crossing the different levels of foundation. Lumber is leaning against excavated dirt wall in foreground, as well as a ladder which reaches up to the base level. Large tank can be seen in top level above building construction. Mountaintop and sky in background.

Handwritten caption below this photo reads: "Completed Foundations for Crusher, with forms being stripped." Men can be seen working on site. Switchback road, power lines and tramline towers are believed to be in valley in background.

Photograph depicts two construction workers in far right sitting on edge above of excavation area, and two construction workers behind them standing at a higher level with construction of lumber walls behind them. The boom and stick of the "Northwest" excavator are semi-visible on left.

Switchback road, power lines and tramline towers are believed to be visible in the background valley. Construction of a long structure near the edge of the excavation area can be seen in midground; this is speculated to be the section of the crusher building which housed conveyor "B".