Your Reputable Source For Metal Recovery Machinery and More
Welcome! Now that you have found the home of Oro Industries on the web, you will not only discover some innovative recovery technologies but also a company whose philosophy is all about the success of your mining project. We are designers and fabricators of free...
Welcome! Now that you have found the home of Oro Industries on the web, you will not only discover some innovative recovery technologies but also a company whose philosophy is all about the success of your mining project. We are designers and fabricators of free metal and mineral recovery equipment with deep roots in mining (three generations).
Our slogan, “Your ore is our business” means that we put a large amount of importance on your particular site and your particular ore matrix. Understanding the ore matrix (elemental makeup) is the first step to proving the most efficient recovery circuit - from the classification of the head ore to its concentration to achieve a smelting-grade product. Analyzing the ore matrix along each step in the processing circuit ensures better recovery without costly mistakes, raising the success level of any mine.
Mining Fact:
“The ore body dictates the design of the equipment. The equipment should never dictate how to mine the ore body!”
“Real genius is simplicity” — Yes, it's another slogan (we like slogans), but it took years of hands-on development to achieve both efficiency and simplicity, resulting in two very unique designs of concentrators — the Multi-Helix Spiral and the Low-G Horizontal Centrifuge. Both are highly efficient yet simple in design, simple to operate, and simple to maintain. Versatility? You bet.
Upgrade your equipment as a stand-alone or plug our products right into your existing process circuit — whether it is geared for the exploration phase, startup production, or expansion of larger operations. Our equipment is particularly suited for mining in developing countries due to its simple operation and maintenance. You will not find a concentrator as efficient or adaptable anywhere in the industry.
Featured Products
The "Martin" Multi-Helix Spiral
Secondary Concentrator

The Multi-Helix Spiral has excellent recovery performance with both alluvial and milled hard-rock ores. It offers the perfect application for mercury recovery and tailings projects. Our equipment is also great for bulk sampling. It has the equal ability of a concentration table but is more practical and versatile. This enables the machine to separate gold, silver, platinum, and any precious metal or mineral that is in a free state.
Two Models:
• 16” Cleaner – 1 to 2 ton/hour
• 16” Finisher – Up to 1 ton/hour
Low-G Horizontal Centrifuge
Primary Concentrator

This equipment is for the primary concentration of classified alluvial ore and milled hard-rock ore. It is known for its high-volume, zero-loss fine gold recovery. Our machine is adaptable to any mine operations, replacing sluices and jigs. It runs on turbid water, which is perfect for recycle and settling ponds.
Two Models:
• 16” Primary Concentrator – up to 15 tons/hour
• 30” Primary Concentrator – up to 40 tons/hour
Mobile Placer Plants

“Move the plant to the ore, not the ore to the plant.”
Made for alluvial applications anywhere in the world, these plants are completely self-contained with onboard diesel power suited for both stationary mining or “on-the-fly” excavating and exploring. These plants incorporate our Horizontal Centrifuge for primary recovery.
Three Models:
• MPP-25 – 50 tons/hour
• MPP-50 – 80 tons/hour
• MPP-100 – 160 tons/hour
About Us
A Bit of History
The “Martin” Multi-Helix Spiral Concentrator was first developed in the mid-1970s by William R. Martin, a brilliant inventor and gold...
The “Martin” Multi-Helix Spiral Concentrator was first developed in the mid-1970s by William R. Martin, a brilliant inventor and gold miner. While commercial mining on the banks of the Yuba River, Bill experienced the typical problems associated with separating gold from the black sand concentrate. In those days, the only viable gold recovery methods and equipment available to separate fine gold were finishing sluices, concentrating tables, mercury amalgamation, and hand panning.
In Bill's case, it was a family operation, and they would all pan the concentrate from the sluice at the end of the day. After a year of panning, Bill was convinced there was be a better way and set out to solve the gold recovery problem. It took two years, but after several gold recovery equipment prototypes and exhaustive trial and error, his innovative "tube spiral" design was perfected — and the Multi-Helix Spiral Concentrator was born. And it was a real killer!
Once in operation on Bill's mine, other local miners witnessed the Spiral's efficiency and wanted one for themselves. So, Bill started up his company, Tri-R Engineering, and began to manufacture and sell the Multi-Helix Spiral to the public. Within a year, the demand for the Spiral was to the point where he put his modest gold mining venture aside and dedicated his time to produce and distribute the Multi-Helix Spiral and other innovative gold recovery equipment.
In 1982, Bill's daughter married Paul Clift, a third-generation placer miner from Yuba County. Bill and his new son-in-law, who eventually became the company's shop foreman and chief designer and fabricator, continued with the business over the following years, shipping more than 2,000 Helix Spirals to many junior and major mining companies worldwide. Some of which are still in operation today!
Bill and Paul also designed and manufactured other specialized gold recovery equipment, always with the same concept of building a better mousetrap. Paul was an inventor in his own right. Between the two of them, they have designed an entire line of innovative ore processing plants and developed the industry's first Horizontal Low-G Centrifuge.
Tri-R Engineering manufactured and sold ore processing plants all over the US, Canada, and other parts of the world such as Africa, South America, and Asia. However, in the mid-1980s, the price of gold had dropped, and interest in gold mining declined substantially. Bill went on to do other things, but Paul never lost his passion for mining and moved to Costa Rica to mine gold in the remote Osa Peninsula up until now.
Oro Industries
Fast forward to the present day, gold prices are up once again, and there is renewed interest in gold mining worldwide. Oro Industries...
Fast forward to the present day, gold prices are up once again, and there is renewed interest in gold mining worldwide. Oro Industries Ltda. was founded by Paul Clift and his new partner to meet this demand and continue with the same ingenuity and relentless effort to build a better mousetrap. Oro Industries has reintroduced the Helix Spiral and other specialized gold recovery equipment for international sales and distribution.
The Helix Spiral is currently being sold in parts of Central and South America and Asia from our Costa Rica operation and is now being offered in the US and Canada based out of Yuba County, California. Yuba County is home to the world-famous Yuba Gold Fields, the largest certified alluvial ore body in the world. And now, it is the testing grounds for the next generation of highly specialized gold recovery equipment.