-----BEGIN PRIVACY-ENHANCED MESSAGE-----
Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
Originator-Key-Asymmetric:
 MFgwCgYEVQgBAQICAf8DSgAwRwJAW2sNKK9AVtBzYZmr6aGjlWyK3XmZv3dTINen
 TWSM7vrzLADbmYQaionwg5sDW3P6oaM5D3tdezXMm7z1T+B+twIDAQAB
MIC-Info: RSA-MD5,RSA,
 KGuS24WYKKllJLxsck9LzmX/HdzpMjCp68vDbTbgY6hIwosFWQKiHarv+LYMnXvt
 9p6A0NxrPQKNYvmXUI6HPA==

<SEC-DOCUMENT>0001130319-08-000626.txt : 20080818
<SEC-HEADER>0001130319-08-000626.hdr.sgml : 20080818
<ACCEPTANCE-DATETIME>20080818143953
ACCESSION NUMBER:		0001130319-08-000626
CONFORMED SUBMISSION TYPE:	6-K
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20080818
FILED AS OF DATE:		20080818
DATE AS OF CHANGE:		20080818

FILER:

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			CAMECO CORP
		CENTRAL INDEX KEY:			0001009001
		STANDARD INDUSTRIAL CLASSIFICATION:	MISCELLANEOUS METAL ORES [1090]
		IRS NUMBER:				980113090
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		6-K
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-14228
		FILM NUMBER:		081024857

	BUSINESS ADDRESS:	
		STREET 1:		2121 11TH ST W
		CITY:			SASKATOON
		STATE:			A9
		ZIP:			S7M 1J3
		BUSINESS PHONE:		3069566200

	MAIL ADDRESS:	
		STREET 1:		2121 11TH ST W.
		CITY:			SASKATOON
		STATE:			A9
		ZIP:			S7M 1J3
</SEC-HEADER>
<DOCUMENT>
<TYPE>6-K
<SEQUENCE>1
<FILENAME>o41672e6vk.htm
<DESCRIPTION>FORM 6-K
<TEXT>
<HTML>
<HEAD>
<TITLE>e6vk</TITLE>
</HEAD>
<BODY bgcolor="#FFFFFF">
<!-- PAGEBREAK -->
<DIV style="font-family: Helvetica,Arial,sans-serif">


<DIV style="width: 100%; border-bottom: 2pt solid black; font-size: 1pt">&nbsp;</DIV>
<DIV style="width: 100%; border-bottom: 1pt solid black; font-size: 1pt">&nbsp;</DIV>






<DIV align="center" style="font-size: 14pt; margin-top: 12pt"><B>UNITED STATES<BR>
SECURITIES AND EXCHANGE COMMISSION</B>
</DIV>

<DIV align="center" style="font-size: 12pt"><B>Washington, DC 20549</B>
</DIV>

<DIV align="center" style="font-size: 18pt; margin-top: 15pt"><B>FORM 6-K</B>
</DIV>


<DIV align="center" style="font-size: 12pt; margin-top: 12pt"><B>Report of Foreign Private Issuer<BR>
Pursuant to Rule&nbsp;13a-16 or 15d-16 Under<BR>
the Securities Exchange Act of 1934</B>
</DIV>


<DIV align="center" style="font-size: 10pt; margin-top: 18pt">For the month of August, 2008
</DIV>

<DIV align="center" style="font-size: 24pt; margin-top: 12pt"><B>Cameco Corporation</B>
</DIV>

<DIV align="center" style="font-size: 10pt">(Commission file No.&nbsp;1-14228)</DIV>


<DIV align="center" style="font-size: 10pt; margin-top: 18pt"><B>2121 &#150; 11th Street West<BR>
Saskatoon, Saskatchewan, Canada S7M 1J3</B><BR>
(Address of Principal Executive Offices)
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 18pt">Indicate by check mark whether the registrant files or will file annual reports under cover
Form 20-F or Form 40-F.</DIV>

<DIV align="center">
<TABLE style="font-size: 10pt" cellspacing="0" border="0" cellpadding="0" width="100%">
<!-- Begin Table Head -->
<TR valign="bottom">
    <TD width="45%">&nbsp;</TD>
    <TD width="10%">&nbsp;</TD>
    <TD width="45%">&nbsp;</TD>
</TR>
<!-- End Table Head -->
<!-- Begin Table Body -->
<TR valign="bottom">
    <TD align="right" valign="top"><DIV style="margin-left:0px; text-indent:-0px">Form&nbsp;20-F&nbsp;&nbsp;&nbsp;<FONT face="Wingdings">&#111;</FONT>
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">Form&nbsp;40-F&nbsp;&nbsp;&nbsp;<FONT face="Wingdings">&#254;</FONT></TD>
</TR>
<!-- End Table Body -->
</TABLE>
</DIV>
<DIV align="left" style="font-size: 10pt; margin-top: 6pt">Indicate by check mark whether the registrant by furnishing the information contained in this Form
is also thereby furnishing the information to the Commission pursuant to Rule&nbsp;12g3-2(b) under the
Securities Exchange Act of 1934.</DIV>

<DIV align="center">
<TABLE style="font-size: 10pt" cellspacing="0" border="0" cellpadding="0" width="100%">
<!-- Begin Table Head -->
<TR valign="bottom">
    <TD width="45%">&nbsp;</TD>
    <TD width="10%">&nbsp;</TD>
    <TD width="45%">&nbsp;</TD>
</TR>
<!-- End Table Head -->
<!-- Begin Table Body -->
<TR valign="bottom">
    <TD align="right" valign="top"><DIV style="margin-left:0px; text-indent:-0px">Yes&nbsp;&nbsp;&nbsp;<FONT face="Wingdings">&#111;</FONT>
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">No&nbsp;&nbsp;&nbsp;<FONT face="Wingdings">&#254;</FONT></TD>
</TR>
<!-- End Table Body -->
</TABLE>
</DIV>
<DIV align="left" style="font-size: 10pt; margin-top: 6pt">If &#147;Yes&#148; is marked, indicate below the file number assigned to the registrant in connection with
Rule&nbsp;12g3-2(b):&nbsp;<U>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</U>
</DIV>


<DIV style="width: 100%; border-bottom: 1pt solid black; margin-top: 10pt; font-size: 5pt">&nbsp;</DIV>
<DIV style="width: 100%; border-bottom: 2pt solid black; font-size: 1pt">&nbsp;</DIV>






</DIV>
<!-- PAGEBREAK -->
<P><HR noshade><P>
<H5 align="left" style="page-break-before:always">&nbsp;</H5><P>
<DIV style="font-family: Helvetica,Arial,sans-serif">
<P align="right" style="font-size: 10pt"><!-- Folio -->Page 2<!-- /Folio -->







<DIV align="left" style="font-size: 10pt; margin-top: 12pt"><B><U>Exhibit&nbsp;Index</U></B>
</DIV>

<DIV align="center" style="margin-top: 6pt">
<TABLE style="font-size: 10pt" cellspacing="0" border="0" cellpadding="0" width="85%">
<!-- Begin Table Head -->
<TR valign="bottom">
    <TD width="3%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="4%">&nbsp;</TD>
    <TD width="4%">&nbsp;</TD>
    <TD width="75%">&nbsp;</TD>
    <TD width="4%">&nbsp;</TD>
    <TD width="8%">&nbsp;</TD>
</TR>
<TR style="font-size: 8pt" valign="bottom">
    <TD nowrap align="center" colspan="3" style="border-bottom: 1px solid #000000">Exhibit No.</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="left" style="border-bottom: 1px solid #000000">Description</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" style="border-bottom: 1px solid #000000">Page No.</TD>
</TR>

<!-- End Table Head -->
<!-- Begin Table Body -->
<TR style="font-size: 3pt" valign="bottom">
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR>

<TR valign="bottom">
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">1.</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">Material Change Report Dated August&nbsp;18, 2008</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top">3 &#151; 4</TD>
</TR>
<!-- End Table Body -->
</TABLE>
</DIV>


<DIV align="center" style="font-size: 10pt; margin-top: 36pt"><B>SIGNATURE</B>
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 9pt">Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused
this report to be signed on its behalf by the undersigned, thereunto duly authorized.</DIV>


<DIV align="center" style="margin-top: 9pt">
<TABLE width="100%" border="0" cellspacing="0" cellpadding="0" style="font-size: 10pt">
<TR>
    <TD width="48%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="35%">&nbsp;</TD>
    <TD width="15%">&nbsp;</TD>
</TR>
<TR>
    <TD valign="top" align="left">Date:&nbsp;&nbsp;August 18, 2008&nbsp;</TD>
    <TD colspan="3" align="left"><B>Cameco Corporation</B><BR>&nbsp;<BR>&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR><TR>
    <TD align="left">&nbsp;</TD>
    <TD valign="top">By:&nbsp;&nbsp;</TD>
    <TD colspan="2" style="border-bottom: 1px solid #000000" align="left"><I>&#147;Gary M.S. Chad&#148;</I>
&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR><TR>
    <TD align="left">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD colspan="2" align="left">Gary M.S. Chad, Q.C.&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR><TR>
    <TD align="left">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD colspan="2" align="left">Senior Vice-President, Governance,<BR>
Law and Corporate Secretary&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR>

</TABLE>
</DIV>
</DIV>
<!-- PAGEBREAK -->
<P><HR noshade><P>
<H5 align="left" style="page-break-before:always">&nbsp;</H5><P>
<DIV style="font-family: Helvetica,Arial,sans-serif">
<P align="right" style="font-size: 10pt"><!-- Folio -->Page 3<!-- /Folio -->

<DIV align="center" style="font-size: 10pt; margin-top: 12pt">
<B>FORM 51-102F3</B></DIV>


<DIV align="center" style="font-size: 10pt; margin-top: 6pt">
<B>MATERIAL CHANGE REPORT</B></DIV>



<DIV align="left" style="font-size: 10pt; margin-top: 12pt"><B>Item&nbsp;1 &#151; Name and Address of Company</B>
</DIV>


<DIV style="margin-top: 6pt">
<TABLE width="100%" border="0" cellpadding="0" cellspacing="0" style="font-size: 10pt">


<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="4%" style="background: transparent">&nbsp;</TD>
    <TD width="1%" nowrap align="left">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>Cameco Corporation (&#147;Cameco&#148;)<BR>
2121 &#150; 11th Street West, Saskatoon, Saskatchewan S7M 1J3</TD>
</TR>

</TABLE>
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 12pt"><B>Item&nbsp;2 &#151; Date of Material Change</B>
</DIV>


<DIV style="margin-top: 9pt">
<TABLE width="100%" border="0" cellpadding="0" cellspacing="0" style="font-size: 10pt">

<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="4%" style="background: transparent">&nbsp;</TD>
    <TD width="1%" nowrap align="left">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>August&nbsp;12, 2008</TD>
</TR>

</TABLE>
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 12pt"><B>Item&nbsp;3 &#151; News Release</B>
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 9pt">The English version and the French translation version of the news release relating to this
material change were distributed and filed by CCN Mathews through their Canadian Timely Disclosure
Pack and U.S. Timely Disclosure Pack on August&nbsp;12, 2008.</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 12pt"><B>Item&nbsp;4 &#151; Summary of Material Change</B>
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 9pt">Cameco suspended remediation work at the No.&nbsp;1 shaft at Cigar Lake after an increase in the rate of
water inflow in the mine was observed. Cameco plans to allow the water in the shaft to return to
the natural equilibrium level over the next few weeks, being the level prior to the commencement of
removal of water from the mine by pumping in late June&nbsp;2008/early July&nbsp;2008. Cameco is assessing
the situation to determine the source and characteristics of the inflow, the implications for
planned remediation work and costs and the impact, if any, on Cigar Lake&#146;s planned production
commencement date.</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 12pt"><B>Item&nbsp;5 &#151; Full Description of Material Change</B>
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 9pt">Remediation work at the No.&nbsp;1 Shaft at Cameco&#146;s Cigar Lake uranium project was suspended on August
12, 2008 after an increase in the rate of water inflow to the mine was observed.</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 9pt">Remediation and dewatering of the No.&nbsp;1 Shaft had been progressing smoothly up to this point, and
the No.&nbsp;1 Shaft had been pumped down to 430 metres below surface when the increase was reported
early on the morning of Tuesday, August&nbsp;12, 2008. Work in the shaft was suspended a few hours
later. During the day, the inflow rate increased steadily to approximately 600 cubic metres per
hour (m<SUP style="font-size: 85%; vertical-align: text-top">3</SUP>/hr), which is beyond the range that can be managed while sustaining work in the
shaft. The mine has a total depth of 500 metres and the mine underground workings are at the 480
metre level.</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 9pt">The water level in the shaft was initially allowed to rise to approximately 100 metres below
surface. This allowed additional data to be gathered from instruments used to monitor groundwater
conditions. This information will be analyzed to determine next steps. As the water level rises,
the rate of inflow will naturally diminish.</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 9pt">Cameco plans to allow water in the No.&nbsp;1 shaft to return to its natural equilibrium level over the
next couple of weeks, being the level prior to the commencement of removal of water from the mine
by pumping in late June&nbsp;2008/early July&nbsp;2008.</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 9pt">On October&nbsp;23, 2006, the underground mine at Cigar Lake was flooded following a water inflow, which
caused a termination of underground activities. Since that time, Cameco has been proceeding with a
phased plan to restore the underground workings at Cigar Lake. During the second half of 2007, a
concrete barrier plug was constructed in the vicinity of the original inflow and grouting was
placed</DIV>

</DIV>
<!-- PAGEBREAK -->
<P><HR noshade><P>
<H5 align="left" style="page-break-before:always">&nbsp;</H5><P>
<DIV style="font-family: Helvetica,Arial,sans-serif">
<P align="right" style="font-size: 10pt"><!-- Folio -->Page 4<!-- /Folio -->


<DIV align="left" style="font-size: 10pt; margin-top: 18pt">around it to seal it off. In February&nbsp;2008, the underground seal was found effective in a test
consisting of lowering the water level to 100 metres below surface. In addition, Cameco completed
an assessment of two areas of the mine and determined that no additional reinforcement or other
precautionary measures were required prior to dewatering.</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 9pt">On June&nbsp;27, 2008, Cameco announced it had received regulatory approval to pump water out of the
flooded Cigar Lake mine. A material change report for this announcement was filed on SEDAR on July
7, 2008.</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 9pt">Cameco is assessing the situation to determine the source and characteristics of the August&nbsp;12,
2008 inflow, the implications for planned remediation work and costs, and the impact, if any, on
Cigar Lake&#146;s planned production commencement date. Before the August&nbsp;12, 2008 inflow, Cameco had
forecast that production would commence at Cigar Lake in 2011, at the earliest, which forecast was
based upon a number of assumptions and subject to a number of risks that could cause delay, including
the occurrence of another water inflow at Cigar Lake.</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 9pt">As previously disclosed, the remediation plan for Cigar Lake includes options to address excess
inflows including additional grouting from surface and ground freezing if necessary.</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 9pt">The above scientific and technical information for Cigar Lake was prepared under the supervision of
Grant Goddard, a professional engineer employed by Cameco as the general manager of the Cigar Lake
project and a qualified person for the purpose of National Instrument 43-101.</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 12pt"><B>Item&nbsp;6 &#151; Reliance on subsection 7.1(2) or (3)&nbsp;of National Instrument 51-102.</B>
</DIV>


<DIV style="margin-top: 9pt">
<TABLE width="100%" border="0" cellpadding="0" cellspacing="0" style="font-size: 10pt">

<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="4%" style="background: transparent">&nbsp;</TD>
    <TD width="1%" nowrap align="left">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>Not applicable.</TD>
</TR>

</TABLE>
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 12pt"><B>Item&nbsp;7 &#151; Omitted Information</B>
</DIV>


<DIV style="margin-top: 9pt">
<TABLE width="100%" border="0" cellpadding="0" cellspacing="0" style="font-size: 10pt">

<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="4%" style="background: transparent">&nbsp;</TD>
    <TD width="1%" nowrap align="left">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>Not applicable.</TD>
</TR>

</TABLE>
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 12pt"><B>Item&nbsp;8 &#151; Executive Officer</B>
</DIV>


<DIV style="margin-top: 9pt">
<TABLE width="100%" border="0" cellpadding="0" cellspacing="0" style="font-size: 10pt">

<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="4%" style="background: transparent">&nbsp;</TD>
    <TD width="1%" nowrap align="left">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>Gary M.S. Chad<BR>
Senior Vice-President, Governance, Law and Corporate Secretary<BR>
Cameco Corporation<BR>
(306)&nbsp;956-6303</TD>
</TR>

</TABLE>
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 12pt"><B>Item&nbsp;9 &#151; Date of Report</B>
</DIV>


<DIV style="margin-top: 9pt">
<TABLE width="100%" border="0" cellpadding="0" cellspacing="0" style="font-size: 10pt">

<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="4%" style="background: transparent">&nbsp;</TD>
    <TD width="1%" nowrap align="left">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>August&nbsp;18, 2008</TD>
</TR>

</TABLE>
</DIV>


<P align="right" style="font-size: 10pt"><!-- Folio -->&nbsp;<!-- /Folio -->
</DIV>



</BODY>
</HTML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
-----END PRIVACY-ENHANCED MESSAGE-----
