Dear Mr

Dear Mr. Ginther,

We already know that using our MMM, multifrequency, wide band, liquid processors, we can accelerate chemical reactions, make faster processing of precious metals, accelerate organic and inorganic extractions, make better and faster wetting, develop very intensive cavitation and brake sand particles and separate metallic inclusions etc.

There are many design options of ultrasonic reactors we cam propose. Basically, you would need to mix your sand-like material with the most proper chemistry (water, cyanides or something else in liquid form…), then pass it trough our reactors, and get mixed, homogenized and final solutions, suitable for centrifugal or some other separation.

Please send me your mailing address, since the best would be that I send you the CD with much more of relevant information.

We also have an excellent design of tubular liquid processing reactors driven externally (producing very strong ultrasonic field internally).

My partner M. Plasencia would contact you to arrange our future relations.

Best Regards,

M. Prokic

PS. In the meantime please see attached files

Address: MP Interconsulting, Marais 36, 2400, Le Locle, Switzerland, phone: +41-32-9314045, www.mpi-ultrasonics.com, mpi@mpi-ultrasonics.com

-----Original Message-----
From: nginther [mailto:nginther@swbell.net]
Sent: Saturday, September 06, 2003 6:30 PM
To: mpi@bluewin.ch
Cc: Edwin Hiserodt
Subject: Heavy Metal Recovery

Gentlemen:

I have perused your web site with great interest. It appears to us that ultrasonic processing could solve several problems that we have with a mining property in Utah that is quite unusual. Your comments and suggestions would be most appreciated.

This area has long been known to contain significant reserves of gold, however, it is very fine. The auriferous material (head ore) covers the surface of the Lands, except in those areas where large sandstone towers and sandstone outcrops exist, and ranges in thickness from 0 to more than 33 feet, the auger length used during testing. The material in the deposit generally exhibits the following average screen size distribution: +40 mesh -- 3.38%; +50 -40 mesh -- 5.95%; +70 -50 mesh -- 8.37%; +120 -70 mesh -- 32.08%; +200 -120 mesh -- 36.45%; +325 -200 -- 9.53; -325 mesh -- 4.23%. The gold particles appear to be virtually all -20 mesh, with the majority being -120 mesh. (Note: mesh refers to the number of holes per square inch in a metal screen) To the Company's knowledge the largest single piece of gold discovered to date in several hundred test samples from these surface materials was approximately 20 mesh (0.85 mm or 0.0335 inches) on its longest side. Some recent tests on samples taken by others and processed on a UHF Concentrator reported recovery of gold particles estimated to be in the 3000-mesh range.

An area of over 80,000 acres has shown by extensive sampling to contain recoverable gold. Based on surface and auger sampling by the principals of the Company and others, the deposit carries rather uniform values throughout, running from 2.5 to more than 7.5 grams per ton both horizontally and vertically. These samples were processed to determine the readily recoverable gold present, not the total gold content. The results of this prior work indicate an economically viable deposit with inferred recoverable gold reserves in excess of 120 million net troy ounces

This property is very unusual for a placer gold deposit, as the gold values appear to be generally uniform throughout the deposit, rather than varying quickly and widely as in a typical gold placer. It is postulated that this occurred because, rather than being reworked and deposited by water, this deposit has been constantly reworked and re-deposited by wind. Thus, the deposit is termed an "Aeolian placer". It is also postulated that the constant reworking of the deposit over the eons has resulted in an unusually homogeneous deposit. No apparent clay problems exist and the head ore is easily slurried. The "sand" portion of the head ore is comprised of approximately 80% silica and 20% calcite grains. The "ore" material weighs approximately 3,220 pounds per cubic yard (silica sand weighs approximately 2,970 pounds per cubic yard) which indicates that it carries significant amounts of heavy minerals. The deposit is also unusual in that it carries free mercury (liquid). Other minerals present include magnetite, hematite and probably a suite of rare earth minerals.

We believe that ultrasonic processing might play an important role in the recovery of the valuable fractions from the "ore". We plan to dry screen the material to - 20 mesh then slurry the material with water and process it through a 300 g centrifugal concentrator. If ultrasonic processing prior to either slurrying (dry) or concentrating (wet) could separate the heavy materials, thus concentrating the heavy fractions and significantly reducing the volume of material going to the concentrator, it would be highly beneficial because it would increase the throughput of the plant. The pilot plant is designed to process a net volume of 130 bcy per operating hour, 24/7, 350 days per year. If successful in pilot operation, the processing facilities will be increased to approximately 2,600 bcy per hour.

Another characteristic of the material that could possibly be treated with ultrasonics is that many fine particles of gold are "stuck" to the grains of calcite and quartz and are not recovered without grinding the material to - 400 mesh, however, grinding does significantly increase the gold recovery. Grinding is not practical due to environmental considerations of sludge processing and disposal. We believe that ultrasonic processing could break the fine gold loose from these grains without grinding.

We are looking forward to your response. Thank you for your time and interest.

Best regards,

Neil E. Ginther

Manager, San Juan Minerals, LLC,