Multi-Helix Reverse Spiral Secondary Concentrator

OUR CLAIM: The Martin Multi-Helix Reverse Spiral is the most efficient gold concentrator in the industry - and has the highest concentration ratio AND highest recovery rate of any gravity concentrator ever built. It has a proven track record, used in a variety of different applications world wide. The Helix Spiral is a commercial duty concentrator for both alluvial and milled hard rock ores. It can be used as a stand-alone unit or connected in series. Allows for full adjustment to the ore-matrix or concentrate, yielding a peak concentration ratio with virtually no loss of gold. 99% recovery of all fine gold down to 100 mesh and less, achieving a finish grade, raw gold product ready for smelting. More practical than a finish table due to its simple operation, adjustability to a wide range of ores including bulk head ore samples, indoor / outdoor use and portability.

Our Line of Recovery Equipment: Multi Helix Spiral (secondary concentrator) Low-G Horizontal Centrifuge (primary concentrator) Mobile Plants - (self contained mobile placer plants)

PHOTO LEFT:Tailings Scavenger Plant

...black sand tailings project at the largest alluvial gold mine in the northern hemisphere. 4 Spiral cleaners and 1 Spiral finisher", all 5 running in series - continuous feed, 25 ton daily production of pure black sand tailings, producing between 1 and 1.5 gr/ton - fine gold.

VersatilityF o r p r o c e s s i n g p r i m a r y s l u i c e concentrate, primary jig concentrate and centrifuge concentrate. Adaptable applications for primary or secondary recovery. Fully adjustable, make "loose" and/or "tight" cuts, adjusts to a wide range of ores and concentrates. You can 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, barite, scheelite, sulfides, tin, galena, bullets etc. Excellent 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!

We are expert designers and fabricators of a complete line of commercial ore processing equipment for both alluvial and hard rock applications. And as miners, we understand the need for rugged built - for maximum life and high efficiency - and a simplified operation that puts the gold in your hands at the end of the day. Equally important is to spec the recovery circuit to suit your particular site and your particular ore matrix.

Mining fact: The ore body dictates the design of the equipment - the equipment should never dictate how to mine the ore body

If you need help analyzing your ore or any other technical facet of your operation, feel free to contact us.

Oro IndustriesYour ore is our business

Photo Right: Multi-Helix / Reverse lead riffles.

Low-G Horizontal Centrifuge Primary Concentrator

The Low-G Horizontal Centrifuge functions as a primary concentrator for classified head ores and is known for its high volume production, zero loss, fine gold recovery. It can run on turbid water and is adaptable to any mining operation. Just plug into the output discharge of your existing trommel or screen deck classifier with a simple feed trough / tube. "Hands off" operation - no adjustments are necessary while running, only a proper slurry feed. A versatile piece of recovery equipment in any mine operation, multiple Centrifuges can be connected parallel for higher volume throughput. It is so adaptable and efficient that we incorporate single and twin units for primary recovery in all of our mobile placer plants.

HOW IT WORKS: The Centrifuge is a low G-Force, batch type Concentrator, designed to operate with clean or turbid water, which makes it ideal for

recycle / recirculation applications. It is a continuous feed (water and ore) Concentrator and batches the concentrate during the run process. In operation at a specific G-Force, the internal chambers fill with lighter material, which form soft fluidized "beds". Gold and heavy minerals and metals are forced to the walls of the chambers where they are trapped. As the slurry continuously enters the Centrifuge, the heavier particles displace the lighter particles. At startup, material starts collecting in the first set of chambers. When the first chambers are full, the material passes to the second chamber, and so on until the Centrifuge is full. Under continuous run throughout the day, the heavy particles are displacing the lighter particles. At the end of the process day, the heavy concentrate is cleaned out by simply decreasing the speed and flushing the concentrate into a receiver. In most cases with typical alluvial and hard rock ores, a properly sized Centrifuge will give you a full days production before it requires flushing.

RECOVERY: If you can pan it we can recover it." If you can see it with the naked eye, the Low-G Centrifuge will recover it. A skilled panner can recover free gold down to 100 mesh and our Low-G Centrifuge has equal ability for free gold recovery. However, in a production environment, recovery rates using gravity separation methods for gold particles down to 200-300 mesh, begin to decline with any gravity separation method. We claim 99% recovery of free gold down to 100 mesh and 80% to 90% recovery down to 200 mesh. Recovery rates of free-gold particles at 300 mesh minus start getting out of reach of physical concentration means and require chemical separation methods. 300 mesh gold is almost colloidal and tends to stay in suspension in the turbid water. Even in clear water, this ultra fine gold stays in suspension almost indefinitely in a production environment. Claims of high recovery rates of 300 mesh gold in a production environment using physical (gravity) means are simply not true.

Water consumption is based on a capacity range - and a typical slurry ratio between 4:1 and 6:1 (water/material). However, actual water consumption depends on the amount of water it takes to wash a particular ore which could be as little as 200 gpm for cleaner placer ores. The 30 Centrifuge has a maximum feed rate of 25-30 yards/hour of screened material. Maximum water capacity not to exceed 500 gpm when processing heavy clay based ores.

LEFT: 40t/hr test unit show mounted on optional trailer with optional feed trough.

RIGHT: 40t/hr model shown adapted to existing mining operation replacing jig concentration circuit.

BELOW: three 40t/hr Centrifuges in a parallel recovery circuit fed directly from a custom scrubber trommel.

Concentrator Models and Pricing

Low-G Horizontal Centrifuge Primary Concentrator

An excellent batch concentrator for primary recovery at volumes from 15-40 tons / hour. Very economical for high volumes of typical alluvial or milled hard-rock ores - Adaptable to any existing classifying circuit - Multiple units can be connected in simultaneous feed for higher volume throughput - Performs well with turbid water, great for recycle loop applications (ponds). For peak production capacity, we recommend classifying the head ore to ! minus.

16" Horizontal Centrifuge: $23,500 / 7.5 cu-meters (10 cu-yards / 15 tons) per hourWater consumption: 150 - 200 gpm

Power: 7.5 hp 3 phase - 60 Hz electric motor / variable speed hydraulic drive

30" Horizontal Centrifuge : $39,500 / 20 cu-meters (26 cu-yards / 38 tons) per hourWater consumption: 200 - 500 gpm

Power: 10 hp / 3 phase - 60 Hz electric motor / variable speed hydraulic drive

* capacity ratings are dry weights and volumes of ore classified to 1/4 minus ** actual water consumption depends on clay content and required washing of a particular ore *

Reverse Multi-Helix Spiral Secondary Concentrator

16 Cleaner - $9,750 A continuous or batch feed secondary concentrator for processing primary sluice concentrate, primary jig concentrate, centrifuge concentrate and milled hard-rock ores. The prefect application for mercury recovery and tailings projects. For highest production performance, classify material to 1/4 minus.

Production rate: 1-2 tons/hour (dry weight)Water consumption: clean water / 15-20 gpm @ 30-40 psi

Power: 1/2 hp 110v 60hz electric motor / fixed rotation gearbox Dimensions: 16 x 48 barrel - 7 ft. overall length x 2 1/2 ft. overall height (5 ft. with stand) / Weight: 775 lbs.

16 Finisher - $9,750 The Finisher model can be used in conjunction with our standard Secondary Cleaner to shorten cleanup time when concentrating large volumes, or in certain custom applications. Highest production performance is with fine concentrates of material less than 1/8. Ask us for advice about your particular application. 90% of all concentration and clean up needs can be achieved with the standard 16 Secondary Cleaner.

Production rate: 1-ton/hour (dry weight)Water consumption: clean water / 15-20 gpm @ 30-40 psi

Power: 1/2 hp 110v 60hz electric motor / fixed rotation gearbox Dimensions: 16 x 48 barrel - 7 ft. overall length x 2 1/2 ft. overall height (5 ft. with stand) / Weight: 775 lbs.

( 16 Spirals come mounted on self-supporting stand - power supply and water pump not included )

Oro Industries 5020 Riosa Rd.

Lincoln, Ca. 95648

MPP-10 (Limited Production, Special Order Only) (Call for details)

Standard Features: 1 yard - vibrating, wet feed hopper Vibrating, scalping screen-deck classifier ( screen) 16 Low G Horizontal Centrifuge (primary concentrator) 18 hp Kohler diesel engine Hydraulic drive system Control Panel 3 Honda water pump (semi-trash pump) Twin axle trailer with leveling jacks

Specs: Capacity: 10 m3/hr (13 yd/hr) up to 20 tons/hr Water consumption: 100-150 gpm Dimensions: H 78 x W 78 x L 174 Weight: 4,420 lbs.

Dont be fooled by their size. The MPP-10 and MPP-25 are commercial duty production and exploration plants, completely self contained and portable. All you need is a backhoe, a water source and some gold bearing ore! Excellent recovery of fine gold with our proprietary Low-G Horizontal Centrifuge. Production with typical alluvial ores would produce 2-3 five gallon buckets of a rich primary concentrate with the MPP-10 model and 4-5 buckets with the MPP-25 model. An average concentration ratio of 1500:1.

Hands off operation. Unique feed system with vibrating, wet hopper for an even, continuous flow onto the screen deck classifier. 3/8 minus material passes through the screen and gravity fed to the centrifuge concentrator. Gold and heavy metals/minerals are concentrated (trapped) inside the centrifuge which is cleaned out at the end of the day. These plants will run equally well on clean or turbid water, perfect for water recycle applications. Complete package makes for a lower overall investment, single operator - very practical for small commercial scale production and exploration.

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Mobile Placer Plants

Unique in the industry is our line of innovative Mobil Placer Ore Processing Plants. These plants are particularly versatile and economical for alluvial mining projects. Well suited for production and exploration - stationary or mobile applications - very compact and portable. Capacities ranging from 25-100 cubic meters / hour with continuous feed from either a backhoe or excavator working alongside feeding ore direct into the plants hopper. Our typical design uses a vibrating, wet hopper that flows onto the vibrating screen deck classifier which gravity feeds into the Low-G Horizontal Centrifuge for primary recovery. At the end of the process day, the primary concentrate can then be processed with the Helix Spiral for final concentrating. A feed hopper wash plant, ore classifier, with primary and secondary concentration. A complete system. These plants are built on a tow-able trailer frame and include onboard power, water pump and electric/hydraulic drive. They are completely self contained. Their mobility is specially suited to move up and down the alluvial plane, moving the plant to the ore instead of excavating and hauling ore to a stationary plant. Less support machinery dedicated to excavate and haul ore means less capital investment and lower mine operation costs. The plant can shift position on the fly taking only 15-20 minutes to reposition the plant using the 4 leveling jacks. Great for exploration programs and/or production. Perfect for fluctuating high and low water conditions due to daily or seasonal rains. Site reclamation is more economical, head-ore tailings go right back in the digging trenches during or shortly after the process day instead of mounting up at multiple excavation sites.

These plants are virtually "plug and play", minimal assembly required and can be shipped overseas in a standard sea container.

2012 Pricing:

Three Models: Each plant incorporates either a single or twin Low-G Horizontal Centrifuge for primary concentration, onboard diesel power source, hydraulic drive system, wet dump adjustable feed hopper, vibrating screen deck classifier, water pump, tailings troughs, primary concentrate bin and manual leveling jacks.

MPP-10 -- 10 cu-meter (13 cu-yards / 20 tons) per hour - Standard plant with single 16 Centrifuge (Limited Production, Special Order Only, Call or Email for details)

MPP-25 -- 25 cu-meter (32 cu-yards / 40 tons) per hour - Standard Plant with single 24 Centrifuge - $ 125,000

MPP-50 - 50 cu-meter (65 cu-yards / 80 tons) per hour - Standard Plant with single 30 Centrifuge - $ 175,000

MPP-100 -- 100 cu-meter (130 cu-yards / 200 tons) per hour - Standard Plant with twin 30 Centrifuges - $295,000( 85kw onboard 60 Hz diesel generator - electric/hydraulic drive - 1000 gpm electric water pump

- operators platform with high pressure monitor nozzle - 4 axle trailer )

Optional features: nugget trap / tailings conveyor with support gantry

By adding an optional 16" Helix Spiral secondary concentrator (stand alone unit - electric and water supply required)these mobile plant packages are a complete turnkey placer mining setup for processing head ore,

down to producing a finish or smelt-able grade product.

* All prices are subject to change without notice *Pub v5.0 - January 2012

Oro Industries 5020 Riosa Rd., Lincoln, Ca. 95648 USA

530-633-0300

www.oro-industries.com / admin@oro-industries.com

* Capacity rating is based on dry weight and volume of typical alluvial ores ** Overall feed rating is based on 50% of the head ore being above 3/8 in size *

* Actual volume throughput will vary depending on washing characteristics of the ore ** Actual water consumption will vary based on the amount of water it takes to wash your particular ore.