Ecomister Evaporator_ booklet

Next Generation Mine Water Disposal Technology.

www.ecomister.ca

Leveraging Nature to Preserve Nature.

The EcoMister Evaporator Series.

Twenty years ago, the wind and water engineering team at Slimline Manufacturing developed the EcoMister 1.0, the first highly effective portable Evaporator technology for the global mining industry. Since then, we have installed over 600 Evaporator Units on sites around the globe.

The initial prototypes were developed and tested at Mascot Mine (currently owned by Barrick Gold) in 1999, in Hedley BC, Canada. The goal of the project was to harness and dramatically accelerate the natural process of evaporation, while sequestering any and all contaminants from the pond, allowing the site to undergo bioremediation, and return to it’s natural state.

The Proof is in the Pond.

The Mascot Mine in Hedley BC, in 1999.

Slimline Engineers developed and tested the original prototypes between 1999 and 2003.

BEFORE:

AFTER:

The original site of the tailings pond at Mascot Mine is now returned to near original condition.

The Science Behind the Results.

In designing the original EcoMister (then called Turbo-Mister), the engineers at Slimline accepted the following evidence, proven in separate studies at Virginia Tech and Ohio State University, as truths: Evaporation is affected by humidity, temperature and wind conditions. The higher the temperature, the lower the humidity and the greater the wind conditions, which lengthen hang time of the spray, exposing it to more air, the greater the amount of evaporation achieved.

The smaller the water particle, the faster it will evaporate, but with a proportionate increase in the potential for “drift”. The Ohio State University report concluded the following: “Spray droplet size is by far the most important factor affecting drift. Spray droplet diameters are measured in micrometers.

A Micrometer is 1/25,000 of an inch, and is usually referred to as a micron. For reference, the thickness of a human hair or a sheet of paper is roughly 75 microns.”

Exposing the maximum volume of water particles to the air with sufficient hang time to enable evaporation, while having the ability to precisely engineer water droplet size and control spray direction and loft would result in maximized evaporation while simultaneously minimizing the potential for drift.

Power Consumption Analysis/Single Model #S30LP Evaporator Unit Calculated based on a $0.06 US Dollar Per Kilowatt Hour power rate

Vaporization and Pump Efficiency for 7 months (210 Days) *

• Total Gallons Evaporated Over 210 Days = 10,019,934 US Gallons • 5112 total hours • $9,790.50 Total cost per 7 month evaporation season • $0.0010 cost per US gallon

* Clarification #1 Our evaporator motor is designed to allow for extremely long electrical runs from source to evaporator. We use a 40 HP motor when the actual horsepower required and consumed is 23.5 HP, if cable is sized correctly for the application. * Clarification #2 Our pump design assumes that the pump is located close to a power source to eliminate loss in cabling. * Clarification #3 Using the pan evaporation data from http://www.wrcc.dri.edu/htmlfiles/westevap.final.html, a US government site, we have calculated the performance of the S30LP as if It was installed at Beowawe U of N ranch in Nevada.

1 Micron = 1/25,000 in.

Spray-droplet diameters are measured in microns.

1 INCH

Precision Engineering.

Predictable Results.

The EcoMister at work.

180’ 90’

SPRAY PATTERN ENGINEERED TO REDUCE WATER PARTICLE COLLISION AND TO REACH MAXIMUM LOFT OR ‘HANG TIME’

INITIAL WATER PARTICLE (DROPLET SIZE & MASS) IS DESIGNED TO BE DISCHARGED AT MAXIMUM PRESSURE

60’ THE WATER PARTICLE REMAINS SUSPENDED AT THE FINAL STAGE OF THE VAPORIZATION CYCLE PATH OF SOLIDS RETURNING TO POND

ACCUMULATION OF POND SOLIDS

Research has shown that there is a rapid decrease in the drift potential of water droplets greater than 150-200 Microns. Droplet size where drift potential becomes insignificant depends on wind speeds, but lies in the range of 150 – 200 Microns for wind speeds of 1-9 MPH (Bode, 1984).

Based upon findings by Virginia Tech, a water droplet size of 150 microns will fall at 1.7 ft/sec, and take 16 seconds to evaporate, requiring the droplets to fall 27.2 feet to ensure evaporation. A water droplet of 100 microns will fall .91 ft/sec, and take 7 seconds to evaporate, which is a drop of only 6.37 feet- opening the door to drift.

3mph wind

10’

20 microns 50 microns 100 microns 150 microns 400 microns 8’

22’

48’

Smaller droplets drift longer distances.

Example of Savings.

Single S30LP EcoMister in operation for 7 months in Nevada in the area around Beowawe U of N ranch : With an average pan evaporation rate of 46% • Daily disposal rate for period was 46,041 US gallons • Average monthly disposal for this period was 1,431,419 US gallons • Total volume disposed in the 7 month period was 10,019,934 US gallons Disposal cost based on power consumed • Total power consumed during operation was 32 KW/hour • Power Cost of 6 cents per Kilowatt • Our cost of disposing 10,019,934 US gallons of water over a period of 7 months was 0.0010 cents per gallon

178’

1056’

Evaporator Models Custom, Heavy Duty and Light Duty.

The Signature 300 Series, developed and enhanced over 20 years of in-field operation, is designed to operate 24 hours a day, 365 days per year. This product has undergone continuous quality improvements through our work with clients in mining, oil and gas, leachate and nuclear waste water.

EcoMister Evaporator Model : S30LP • Manufactured from a combination of 304L stainless and carbon steel • Our largest enhanced evaporation fan- 30” • Our most popular coating system, Scotch Coat 134 powder coat • Custom manufactured electric motor that exceeds the 841 standards, with stainless steel motor shafts and specialty high-corrosion paint • 300 series motors are designed with a 50% safety margin to allow for excessive cabling runs and power quality (traditionally installed 40HP motor, actual operation demand at 25HP) • Dual independent fan support bearings, separated by vibration coupling which does not allow thrust/ vibration to transfer from fan thrust and/or fan vibration to the motor • Powder coated Aluminum fan. Available in stainless steel for severe corrosion applications • Independently inspected and quality controlled • Additional quality control to ensure that operational vibration is below .5 mil • Quick release nozzle ring with Teflon nozzles • 300 Series is available in a variety of configurations, from land-based to float-based to units with sound enclosures • Pump volume through unit = 80.1 gallons/minute at 150 psi • Average weight standard land-based unit = 1,540 pounds

Light Industrial 240 Series The 240 series is our lighter commercial series developed specifically for operations that do not require continuous operation, nor the corrosion resistance of the 300.

240 Series • Manufactured from carbon steel • Our mid-range enhanced evaporation fan- 24” • Treated with automotive epoxy, paint, and primer • Manufactured electric wash down, with carbon steel motor shafts and standard painted motors • 240 Series motors designed with 1.2 safety margin • Fan supported by a single bearing for radial loads system, directly connected to the motor • Independently inspected and quality controlled • Additional quality control to ensure that operational vibration is below .5 mil • Quick release nozzle ring with Teflon nozzles • 240 series available in a variety of configurations from land-based wheeled, skid mounted and float based • Pump volume through unit is 60 US gallons/minute at 100 psi • Average weight standard equipped land-based unit 1,000 pounds

Custom Applications With 20+ years of international experience in a diverse range of environments, climates and topography, Slimline Manufacturing has a solution for you. Let our engineering team help you protect and manage your waste water disposal with a safe, cost-effective and secure technology.

The Last Mile in Mine Water Disposal.

Extending the life of a tailings pond, decreasing your ecological footprint, reducing disposal costs and improving the profitability of a mine is within your reach.

By answering these five questions, we can provide you with a cost/benefit analysis, operational quote, total evaporation projections and disposal time frame.

• What • What • What • What • What

is the amount of fluid you wish to dispose of, and over what period of time? is the pan evaporation data for the site? are the wind patterns for the site? is the size of your pond or containment area? is the electrical supply at the site? Eg., phase, voltage, frequency, etc.

Facts you should know, based on 600+ installations worldwide.

Operational Facts Based on the S30LP EcoMister • S30LP (land base complete with pump system) • Disposal volume potential of 80.1 GPM • Total power consumption is 32 Kw/hr • The lowest potential evaporation achievable of 30% will convert to a pan evaporation rate of 3”

Maintenance Over a 10 Year Period • 1-3 year “zero”. This may vary by customer depending on the TSS (total suspended solids in their water) Nozzle wear dependent on TSS contained within the water • 4 year - $1,000 - bearings and spray nozzles • 5-10 years - $5,000 - potentially a new pump based on historical data

www.ecomister.ca

Designed, Engineered and Manufactured by:

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