"..Was curious about the differences in the Teck A & B shares and tried to find the differences.

Went to the last Teck annual report and could not locate a definitive explanation of the differences, if it was there..."

Basically, Class A has the controlling votes: each Class A shares has 100 votes compared to 1 vote for each Class B share.

Here is the relevant info in Note 14 of Teck's 2010 Consolidated Financial Statements:

14. Equity

a) Authorized Share Capital

Our authorized share capital consists of an unlimited number of Class A common shares without par value, an unlimited number of Class B subordinate voting shares (“Class B shares”) without par value and an unlimited number of preferred shares without par value issuable in series.

Class A common shares carry the right to 100 votes per share. Class B shares carry the right to one vote per share. Each Class A common share is convertible, at the option of the holder, into one Class B share. In all other respects, the Class A common shares and Class B shares rank equally.

The attributes of the Class B shares contain so called “coattail provisions,” which provide that, in the event that an offer (an “Exclusionary Offer”) to purchase Class A common shares, which is required to be made to all or substantially all holders thereof, is not made concurrently with an offer to purchase Class B shares on identical terms, then each Class B share will be convertible into one Class A common share.

The Class B shares will not be convertible in the event that an Exclusionary Offer is not accepted by holders of a majority of the Class A common shares (excluding those shares held by the person making the Exclusionary Offer). If an offer to purchase Class A common shares does not, under applicable securities legislation or the requirements of any stock exchange having jurisdiction, constitute a “takeover bid,” or is otherwise exempt from any requirement that such offer be made to all or substantively all holders of Class A common shares, the coattail provisions do not apply.

FYI only.