Dear Editor, In listening to the radio interview reviewing the Lake County Press headlines for your Feb. 4 issue, I heard Kitty Mayo mention an interview stating that our nearby geologic formation, the Duluth Complex, is the largest copper-nickel (Cu-Ni) deposit in the world. The Duluth Complex does hold the largest reserve of Cu-Ni in North America: that is, if you add up all the copper and nickel in the deposit it is very large. If we were able to mine ALL the Cu-Ni in the Duluth Complex, then it would indeed be a great quantity. Please keep in mind that there's a difference between 'largest' and 'richest' and “accessible.” The Cu-Ni ore occurs in several different deposits across the Duluth Complex, many of which are low grade, although some have high concentrations. When mineral deposits are not rich (highly concentrated) that means more rock must be mined and processed to get the same amount of ore as might come from richer (more concentrated) deposits. The phrase “largest in the world” is similar to descriptors we often use about Lake Superior: it is the biggest freshwater lake in the world BY SURFACE AREA, but it does not hold the most water. Thus, it is NOT the largest lake in the world (unless one is explicit in stating 'surface area' and 'freshwater'). If you have the “fastest” car in your neighborhood, does that mean it goes from 0 to 60 mph most quickly, covers a mile in the least amount of time, or would win the Indy 500?