Macusani Yellowcake Inc.
TSX VENTURE : YEL
FRANKFURT : QG1

Macusani Yellowcake Inc.

September 15, 2010 14:39 ET

NI 43-101 for Macusani Yellowcake 100%-Owned Colibri 2&3 Uranium Project in Puno, Peru Is Now Available on SEDAR

Contained U308 in Indicated Resources Exceeds 5.4 Million lbs (an Increase of 158%) and in Inferred Resources Exceeds 15.1 Million Pounds (At a 75 ppm U Cutoff Grade)

TORONTO, ONTARIO--(Marketwire - Sept. 15, 2010) - Macusani Yellowcake Inc. (the "Company") (TSX VENTURE:YEL)(FRANKFURT:QG1) is pleased to announce the updated independent National Instrument ("NI") 43-101 compliant resource estimate for its 100% owned Colibri 2&3 Property in Puno, Peru is now available on SEDAR (www.sedar.com).

As previously announced on August 3, 2010, the new resource estimate compared with the previous resource estimate shows an increase of contained U3O8 at the 75 ppm cutoff grade in the Indicated category by 158% to 5.41 million lbs at a grade of 0.027% U3O8 (0.535 lbs U3O8 per ton) compared with 2.10 million lbs at a grade of 0.022% (0.443 lbs U3O8 per ton). In addition, the contained U3O8 in the Inferred category increased by 4.5% to 15.15 million lbs at a grade of 0.020% (0.389 lbs U3O8 per ton) compared with 14.49 million lbs at a grade of 0.017% (0.335 lbs U3O8 per ton).

A summary of the Company's Colibri 2&3 and recently released Corachapi (see September 8, 2010 press release) are summarized in the table below.

    Colibri 2&3   Corachapi
Measured Resources*   na   0.3 mm lbs
0.014% U3O8 (0.28 lbs/ton)
Indicated Resources*   5.4 mm lbs
0.027% U3O8 (0.53 lbs/ton)
  4.7 mm lbs
0.020% U3O8 (0.40 lbs/ton)
Inferred Resources*   15.1 mm lbs
0.020% U3O8 (0.40 lbs/ton)
  1.9 mm lbs
0.023% U3O8 (0.46 lbs/ton)
Ownership   100%   100%
Strike Length Drilled   82%   32%
Down-dip Extension   open   open
*75 ppm cutoff grade    

The full Colibri 2&3 NI 43-101 is also available at www.macyel.com/reports.

Qualified Person

Mr. David Robert Young, B.Sc. (Hons), FGSSA, MSAIMM, FAusIMM, Pr Sci Nat (400989/83) of The Mineral Corporation, South Africa, an independent consultant to the Company, is a Qualified Person as defined under National Instrument 43-101, and has reviewed the scientific and technical data contained in this release.

About Macusani Yellowcake

Macusani Yellowcake Inc. is a Canadian uranium exploration company with over 24,000 hectares (240 km2) of mineral properties in southeastern Peru, on the Macusani Plateau. The shares are traded on the TSX Venture Exchange under the symbol 'YEL' and on the Frankfurt Exchange under the symbol 'QG1'.

There are 59,881,284 common shares of Macusani Yellowcake Inc. outstanding.

This news release includes certain forward-looking statements concerning the future performance of Macusani's business, operations and financial performance and condition, as well as management's objectives, strategies, beliefs and intentions. Forward-looking statements are frequently identified by such words as "may", "will", "plan", "expect", "anticipate", "estimate", "intend" and similar words referring to future events and results. Forward-looking statements are based on the current opinions and expectations of management. All forward-looking information is inherently uncertain and subject to a variety of assumptions, risks and uncertainties, including the speculative nature of mineral exploration and development, fluctuating commodity prices, competitive risks and the availability of financing, as described in more detail in the Company's recent securities filings available at www.sedar.com. Actual events or results may differ materially from those projected in the forward-looking statements and Macusani cautions against placing undue reliance thereon. Neither Macusani nor its management assume any obligation to revise or update these forward-looking statements.

Neither the TSX Venture Exchange nor its Regulation Services Provider (as that term is defined in the policies of the TSX Venture Exchange) accepts responsibility for the adequacy or accuracy of this release.

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