374g Fully Polished Silver/Gold Ore Block • Koch Shaft MO • Cox Collection For Sale

• Locality: Koch Shaft, Silver Mines District, Madison County, Missouri

• ​Provenance: Ex. Cox Collection

• ​Primary Minerals: Argentiferous Galena (Silver Ore), Gold-Bearing Sulfides, Quartz

• ​Weight: 374 Grams (13.2 oz)

• ​Dimensions: 3.0\" x 2.0\" x 1.5\"

• ​Condition: Lapidary Finished (Precision cut and polished on all faces)

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​Historic Provenance: The Cox Collection

Welcome to KeepsCache. We are proud to offer this elite, custom-finished 374-gram cabinet specimen from the historic Koch Shaft in the Silver Mines District of Missouri. Formerly housed in the noted Cox Collection, this old-stock geological specimen captures the legendary precious-metal veins of the St. Francois Mountains in a flawless display format.

​The Precious Metal Assemblage

The Koch Shaft was historically mined for its unique deposits of heavy, precious-metal-bearing ores. This block perfectly isolates that sought-after mineralization:

• ​The Silver Ore (Argentiferous Galena): Slashing heavily through the quartz matrix are thick, metallic, silver-grey veins of Argentiferous Galena. This specific high-grade galena is rich in silver content and is the exact ore that gave the \"Silver Mines\" district its name.

• ​The Gold-Bearing Sulfides: Running alongside and intergrown with the galena are bright, brassy pockets of complex sulfides known historically to carry gold traces, adding brilliant, flashing metallic contrast to the stone.

• ​The Matrix: The heavy metal ores are locked securely inside a dense hydrothermal quartz matrix, showcasing beautiful natural fracturing and structural iron staining.

​Expert Lapidary Finish

Unlike standard rough ore, this specimen has been meticulously lapidary-finished on every single face. The multi-faceted, fully polished block format acts as a 360-degree window into the hydrothermal vein, allowing the piece to be displayed from any angle while highlighting the incredible internal structure of the heavy metals.

​This is a premium, high-gloss reference piece. For the serious collector of midwestern mining history, precious metal ores, or custom lapidary displays, this Cox Collection block is a flawless dir=\"ltr\" style=\"margin-top:0; margin-bottom:0;\">Koch Shaft ore, Silver Mines Missouri, Cox Collection minerals, KeepsCache, Madison County MO, argentiferous galena, silver ore, gold bearing sulfides, fully polished mineral, lapidary display block, hydrothermal quartz, midwest rockhound, historic mining artifact, St. Francois Mountains geology.