This Day On The Street
Continue to site right-arrow
This account is pending registration confirmation. Please click on the link within the confirmation email previously sent you to complete registration.
Need a new registration confirmation email? Click here
Stocks Under $10 with 50-100% upside potential - 14 days FREE!

Duluth Metals Provides Metallurgical Update On Twin Metals Minnesota Project

Stocks in this article: DM


Three concentrates from the Twin Metals project were successfully processed through Teck's hydrometallurgical research facility utilizing the CESL™ process for approximately a six week period in Q1 of 2013. The concentrates processed through the pilot plant consisted of three different concentrates from the Twin Metals resource. The first concentrate was a bulk concentrate (all metals floated in one concentrate) made from a mixed sample of material from the Maturi and Birch Lake deposits. The second concentrate was a bulk concentrate made from material derived from the western portion of the Maturi deposit. The third concentrate was a nickel concentrate derived as one of two products from the ALS flotation pilot plant during the period when a separate copper and nickel concentrate was being produced from ore from the western portion of the Maturi deposit.

The concentrate characteristics were:

  • Maturi Bulk #1 - produced from Maturi East and Birch Lake deposits (17.0 % Cu, 3.7 % Ni and 20.4 g/t TPM (Total Precious Metals or TPM = Platinum+Palladium+Gold));
  • Maturi Bulk #2 - produced from Maturi West deposit (15.5 % Cu, 4.1% Ni and 9.0 g/t TPM);
  • Maturi Ni-Cu - produced from Maturi West deposit after separation of a high grade Cu concentrate ( 6.9 % Cu, 8.0 % Ni and 10.6 g/t TPM).

The main goals for each of the concentrates were to determine optimal base metal extraction while also recovering precious metals. Multiple variables were tested in the leaching circuits to determine the optimal operating conditions for recovery of metals.

Overall CESL™ pilot plant metal recoveries from concentrate are presented in Table 1. The results for the two bulk samples are combined due to limited run time for the second sample.

        Table 1: Maturi Metal Recoveries from Concentrate
    Concentrate                   Metal Recovery
                                  % Cu       % Ni
    Maturi Bulk #1                93.7       96.1
    Maturi Bulk #2
    Maturi Ni-Cu                  91.2       97.6

Recovery of Precious Metals from CESL™ residue

3 of 5

Select the service that is right for you!

Action Alerts PLUS
Try it NOW

Jim Cramer and Stephanie Link actively manage a real portfolio and reveal their money management tactics while giving advanced notice before every trade.

Product Features:
  • $2.5+ million portfolio
  • Large-cap and dividend focus
  • Intraday trade alerts from Cramer
  • Weekly roundups
TheStreet Quant Ratings
Try it NOW
Only $49.95/yr

Access the tool that DOMINATES the Russell 2000 and the S&P 500.

Product Features:
  • Buy, hold, or sell recommendations for over 4,300 stocks
  • Unlimited research reports on your favorite stocks
  • A custom stock screener
  • Upgrade/downgrade alerts
Stocks Under $10
Try it NOW

David Peltier, uncovers low dollar stocks with extraordinary upside potential that are flying under Wall Street's radar.

Product Features:
  • Model portfolio
  • Stocks trading below $10
  • Intraday trade alerts
  • Weekly roundups
Dividend Stock Advisor
Try it NOW

Jim Cramer's protege, David Peltier, identifies the best of breed dividend stocks that will pay a reliable AND significant income stream.

Product Features:
  • Diversified model portfolio of dividend stocks
  • Alerts when market news affect the portfolio
  • Bi-weekly updates with exact steps to take - BUY, HOLD, SELL
Real Money Pro
Try it NOW

All of Real Money, plus 15 more of Wall Street's sharpest minds delivering actionable trading ideas, a comprehensive look at the market, and fundamental and technical analysis.

Product Features:
  • Real Money + Doug Kass Plus 15 more Wall Street Pros
  • Intraday commentary & news
  • Ultra-actionable trading ideas
Options Profits
Try it NOW

Our options trading pros provide daily market commentary and over 100 monthly option trading ideas and strategies to help you become a well-seasoned trader.

Product Features:
  • 100+ monthly options trading ideas
  • Actionable options commentary & news
  • Real-time trading community
  • Options TV
To begin commenting right away, you can log in below using your Disqus, Facebook, Twitter, OpenID or Yahoo login credentials. Alternatively, you can post a comment as a "guest" just by entering an email address. Your use of the commenting tool is subject to multiple terms of service/use and privacy policies - see here for more details.
Submit an article to us!


DOW 17,356.87 +288.00 1.69%
S&P 500 2,012.89 +40.15 2.04%
NASDAQ 4,644.3120 +96.4780 2.12%

Brokerage Partners

Rates from

  • Mortgage
  • Credit Cards
  • Auto

Free Newsletters from TheStreet

My Subscriptions:

After the Bell

Before the Bell

Booyah! Newsletter

Midday Bell

TheStreet Top 10 Stories

Winners & Losers

Register for Newsletters
Top Rated Stocks Top Rated Funds Top Rated ETFs