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The “Martin” Multi-Helix Spiral Gold Concentrators OUR CLAIM: The Multi-Helix Spiral is “hands down” the most efficient gold concentrator available in the industry. It has a proven track record with a recovery rate of 99% of all free gold. It is a commercial duty, gravity concentrator for both alluvial and fine milled hard rock ores and has the highest concentration ratio AND highest recovery rate of any gravity concentrator on the market today. The Multi-Helix Spiral allows for full adjustment to the ore-matrix or concentrate yielding a peak concentration ratio with virtually no loss of gold. With the ability to adjust to any ore matrix, the spiral recovers all fine gold down to 100 mesh and less. So fine that it cannot be panned nor seen with the naked eye, only with a loop, resulting in a finish or smelting grade concentrate. The Helix Spiral is more practical and more efficient than a concentrating table due to it’s simple operation, continuous feed and higher volume (4 times the volume of a 4’x8’ finish table). Send us your ore sample and we will show you what you are missing with your present concentrator! |
Multi-Helix Gold Spiral THE WORLDS MOST EFFICIENT GOLD CONCENTRATORSWE GUARANTEE IT !! | |
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How it works: The actual "working surface" of the concentrator is made up of a series of leads (pronounced "leeds") running lengthwise “in reverse” in a critical tight spiral pattern along the inner barrel. The leads have a 45 degree angle on one side and a 90 degree angle on the other, and are larger in height and width at the rear of the barrel than at the front. (exact dimensions to create ultimate efficiency took hundreds of hours of trail and error testing). During operation, the decreasing height and width of the leads create the classifying effect as the ore passes through the barrel. As the ore is being classified, the gold and heavy concentrate settle into the bottom of the groves made by the leads and is conveyed upwards (in reverse). As the classified ore reaches the upper portion of the barrel, a set of angled spray heads continuously “wash back" the lighter gangue material while the gold and heavy concentrate continue moving forward, falling out of the groves and into the concentrate holding bin. This is a continuous process allowing the gold concentrate to be recovered in a hands off fashion while the waste is being discharged out of the rear of the Spiral. For larger volume processing, multiple Spirals can be installed in "series" with the ore being feed automatically from one Spiral to the next. |
Versatility: For processing primary sluice concentrate, primary jig concentrate and centrifuge concentrate - applications for either primary or secondary recovery - fully adjustable, make "loose" and/or "tight" cuts, adjusts to a wide range of ores and concentrates - re-concentrate heavy gold concentrate to achieve a smelting grade product - also great for bulk sampling and testing head ores - continuous feed or batch feed - portability allows you to move around your site or work off site (indoors or outdoors) - classify any heavy metal or heavy mineral - recover precious stones and gems, diamonds, barite, scheelite, sulfides, tin, galena, bullets etc. Great for mercury recovery and tailings projects. All considered, the Helix Spiral is the most versatile and practical piece of mining equipment you will ever own! |
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The new generation of Helix Spirals can be fitted with an optional magnetic separator we call the Magnecon. An excellent application for “black sand” concentrates with heavy magnetics, typical in alluvial concentrate where as much as half or more of the concentrate is magnetic. The Magnecon will separate as much as 90% or more of the magnetite as it enters the Spiral. As show in this photo, the magnetics are picked up by the center white tube and scraped off and sent out the end. |
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The Helix Spiral is also excellent for bulk sampling. At this mine, they are testing head ores to assess the ore body and areas of the property with potential values for excavation. Exploration and ore body assessment is an important facet of alluvial mining. |
Bulk sample showing good values of fine gold |
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| In the field: The Spiral requires clean water with good pressure 10 gpm at 40 psi. Notice the simple water filter system to the right. At this mine, they pump the water from a man made pond fed by a natural stream. (shown here with cage guard) | In the lab: the Spiral can also be setup indoors for final concentration and smelting of the gold. |
Helix-Spiral Gold Concentrators in “Series”
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Spiral Models and Applications 16” Secondary Cleaner - A continuous or batch feed secondary concentrator with a production rate of 1-2 tons per hour. An exceptionally versatile concentrator for processing primary sluice concentrate, primary jig concentrate, centrifuge concentrate, and milled hard-rock ores. Excellent application for mercury recovery and tailings projects. 24" Primary Rougher - A larger volume work horse, used for primary concentration of classified head ores or milled hard-rock ores, particularly milled sulfide ores. A continuous or batch feed primary concentrator with a production capability of 5-7 tons per hour. Prices are FOB Marysville, CA - Units come mounted on self supporting frame. Contact us for more info, specs and pricing |
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Oro Industries Ltda.
San Isidro, Costa Rica
Yuba Goldfields, CA.