Discover the Stutenroth Impact Mill: Efficient Ore Crushing for Small-Scale Mining Operations
Overview of the Stutenroth Impact Mill
The Stutenroth Impact Mill (often referred to as the Stutenroth Rock Mill or simply Stutenroth Mill) is a specialized piece of mining equipment designed for crushing and pulverizing hard rock ore, primarily in small-scale mining operations. It is manufactured byStutenroth Milling & Manufacturing, Inc., a company based in Arizona. This mill is particularly popular among gold prospectors and small miners for its ability to reduce ore to fine particles, which facilitates the liberation and recovery of precious metals like gold. It operates as an impact crusher, using high-speed rotating components to smash rock against steel surfaces, producing output suitable for further processing in gravity concentration, sluicing,tabling, or leaching systems. Below is a comprehensive summary of its beginning, history, technical details, and efficacy for gold recovery, based on available sources, updated with newly provided founder and incorporation details from Arizona Corporation Commission records.
Beginning and History
Stutenroth Milling & Manufacturing, Inc. was incorporated as a domestic for-profit corporation in Arizona on August 10, 1976, with Business ID 01062524. The company is classified under “Other-MINING” and has authorized 1,000,000 common shares, with a perpetual period of duration. Its known place of business and mailing address is 3207 E Cornman Rd, Casa Grande, AZ 85194, in Pinal County. As of January 30, 2026, the company status is Pending Inactive due to failure to file annual reports for 2023, 2024, and 2025 (last filed in 2022), with a pending administrative dissolution. The statutory agent is listed as Archie Stutenroth, and the principal information identifies Archie L. Stutenroth as both Director and President/CEO (Chief Executive Officer), indicating he is the founder and key figure behind the company. The name “Stutenroth” derives from this individual, who appears to have established the business to produce mining equipment tailored for small-scale operations.
The earliest direct reference to the company’s products comes from a 1983 mining advertisement, which promotes their “Production Impact Mills” for mining applications. This aligns with the company’s formation in the mid-1970s, likely in response to the needs of small-scale miners during a period of renewed interest in gold prospecting in the U.S. (e.g., following gold price surges in the late 1970s). The mill’s design draws from traditional impact milling technology, which has roots in 19th-century mining innovations, but Stutenroth’s version is tailored for portable, affordable use by independent prospectors.
Evolution and Milestones:
- 1976: Incorporated in Arizona by Archie L. Stutenroth.
- 1980s: Advertised as a production tool for miners, emphasizing durability and efficiency for ore processing.
- 1990s–2000s: Gained popularity in gold mining communities, with models integrated into wash plants and crushing setups. Filing history shows consistent annual reports from 2003 onward, with a notice of pending administrative dissolution in 2003 that was resolved.
- 2013: CGrowth Capital, Inc., a mining company, purchased two Stutenroth Crushing Mills (valued at $133,600 total) for raw ore processing in their operations, highlighting its ongoing relevance in commercial mining.
- Recent Years (2020s): Still in use and discussed in mining forums, YouTube videos, and environmental permits. For example, a 2023 YouTube video by Hard Rock University demonstrates a repaired Stutenroth Mill in action, used for rock crushing in gold-related contexts. A 2024 Nevada environmental fact sheet details its installation at the Columbus Salt Marsh Project for gold recovery. Enthusiasts in groups like Montana Gold Prospectors on Facebook share experiences with used models, indicating a secondary market for these mills.
The mill’s history reflects the broader evolution of small-scale mining equipment in the U.S., where innovations focused on portability and cost-effectiveness for independent operators amid fluctuating gold prices. It has remained a niche product, with no evidence of large-scale production or corporate acquisitions.
Technical Details
The Stutenroth Impact Mill is a robust, steel-constructed impact crusher designed for high-throughput rock reduction. It features a feed inlet, rotating hammers or a steel fan (flywheel), V-shaped steel impact plates, and a screen for output sizing. Ore is fed into the top, diverted to the interior where it’s pulverized by high-speed impacts, and exits through the bottom. It can handle hard rock like quartz or granite, reducing it to fine powder (e.g., minus 100-mesh or ¼-inch minus).
Key specifications vary by model, but common ones include:
| Model/Capacity | Motor | Feed Size/Inlet | Output Size | Throughput | Additional Features |
|---|---|---|---|---|---|
| 1 TPH (e.g., at Columbus Project) | 8–20 HP electric (gear reduction optional) | Up to ½-inch minus (post-jaw crusher) | Minus 100-mesh | 1 ton per hour | Dry or wet operation; can recirculate for finer grind. |
| 2 TPH | 8–20 HP | Variable | Fine powder for sluicing/tabling | 2 tons per hour | Portable; often skid-mounted. |
| 5–6 TPH | 40 HP | 6x12-inch inlet | ¼-inch minus | 5–6 tons per hour | High-volume for small operations. |
| 10 YD/H (Wash Plant Model) | 63 HP diesel (Perkins) | Integrated with 2 YD/H jaw crusher | Variable | 10 yards per hour | Part of full gold wash plant setups. |
Operation Modes:
- Dry: Produces dust (requires ventilation or dust control to avoid health risks like silicosis). Output is stockpiled or conveyed directly.
- Wet: Water (e.g., 8 gallons per minute) is added, creating a slurry that’s pumped to further processing.
- Maintenance: Mills are repairable; videos show rebuilds using resin for wear parts. Balance is critical to prevent vibration from high-speed rotation.
- Integration: Often paired with jaw crushers (to pre-reduce ore) and conveyors in setups like gold wash plants or gravity circuits.
- Cost and Availability: Used models are available through equipment dealers (e.g., Savona Equipment) or online marketplaces. New or historical pricing isn’t widely documented, but 2013 purchases valued pairs at over $130,000.
Efficacy for Gold Recovery
The Stutenroth Impact Mill is highly regarded for gold recovery in small-scale and artisanal mining. Its primary benefit is reducing ore to a fine consistency, which liberates microscopic gold particles trapped in rock, making them easier to separate via gravity methods or chemical leaching. Users report it as a “beast” for smashing rock efficiently, with output ready for sluicing, tabling, or concentration circuits.
Advantages:
- Efficiency: Processes ore quickly (1–6 TPH), ideal for prospectors handling limited volumes.
- Portability: Many models are skid-mounted or trailer-ready, suitable for remote sites.
- Cost-Effective: Affordable for small operations compared to large industrial crushers; good for recovering fine gold that jaw crushers alone might miss.
- Versatility: Works with various ore types (sand, clay, hard rock); can achieve fine grinds (e.g., 100-mesh) for better recovery rates in leaching with solutions like thiosulfate or acids.
- Real-World Examples: Used in Nevada’s Columbus Salt Marsh Project for gravity concentration and resin-based gold extraction. Prospectors in Montana and elsewhere integrate it into hammermill setups for gold ore, often after jaw crushing.
Limitations:
- Dust production in dry mode requires safety measures.
- Not suited for very large-scale mining; best for 1–10 TPH operations.
- May require multiple passes for extremely hard ore.
Overall, it’s considered excellent for gold recovery by hobbyists and small miners, with positive feedback in mining communities for its reliability and performance in liberating gold from quartz or other host rocks. If more specific aspects (e.g., parts diagrams) are needed, further targeted searches could be done.
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