On September 7, 2012, Quicksilver Resources Canada Inc. ("QRCI"), a subsidiary of Quicksilver Resources Inc., and NOVA Gas Transmission Ltd. ("NGTL"), a subsidiary of TransCanada Pipelines Limited, entered into a PEA Amending Agreement (the "PEA Amending Agreement"). The PEA Amending Agreement amended the terms of the Project and Expenditure Authorization, dated as of April 6, 2011, between QRCI and NGTL, to, among other things, delay the targeted in-service date of the subject pipeline and meter station facilities from May 1, 2014 to August 1, 2015, and revise NGTL's spend profile and QRCI's obligations to provide related financial assurances in the form of letters of credit. Assuming the project is fully constructed at the estimated after tax amount of C$296.8 million, the cumulative letters of credit would be placed as follows:

                         NGTL Cumulative
                       Financial Assurances
                        (C$ in thousands)

     September 1, 2012       $ 29,680
     April 1, 2014           $ 59,360
     July 1, 2014            $148,400
     September 1, 2014       $296,800

On September 7, 2012, in connection with the PEA Amending Agreement, QRCI and NGTL entered into an Amendment to Commitment Letter Agreement (the "Commitment Letter Amendment"). The Commitment Letter Amendment amended the terms of the Commitment Letter Agreement, dated as of April 6, 2011, between QRCI and NGTL, to, among other things, defer QRCI's obligations to deliver gas to the subject pipeline to the new in-service date of August 1, 2015.

The foregoing summaries are not intended to be complete and are qualified in their entirety by the full texts of the PEA Amending Agreement and the Commitment Letter Amendment, copies of which are attached as Exhibits 10.1 and 10.2, respectively, to this Form 8-K and incorporated herein by reference.

QRCI is a party to transportation agreements with NGTL.

The descriptions of the PEA Amending Agreement and the Commitment Letter Amendment in Item 1.01 above are incorporated herein by reference. Copies of the PEA Amending Agreement and the Commitment Letter Amendment are attached as Exhibits 10.1 and 10.2, respectively, to this Form 8-K and incorporated herein by reference.

(d) Exhibits.

  Exhibit
  Number    Description

   10.1     PEA Amending Agreement, dated as of August 28, 2012, between
            Quicksilver Resources Canada Inc. and Nova Gas Transmission Ltd.
   10.2     Amendment to Commitment Letter Agreement, dated as of August 28,
            2012, between Quicksilver Resources Canada Inc. and Nova Gas
            Transmission Ltd.