Mansfield Minerals Announces Positive Pre-Feasibility Results; 161,000 Oz Average Annual Production in Years 1-5 at US$373/Oz Cash Cost

ENPNewswire-23 March 2010-Mansfield Minerals Announces Positive Pre-Feasibility Results; 161,000 oz Average Annual Production in Years 1-5 at US$373/oz Cash Cost(C)2010 ENPublishing - http://www.enpublishing.co.uk Release date- 22032010 - Vancouver, British Columbia - Mansfield Minerals Inc. (TSX.V - MDR) Mansfield Minerals Inc. ('Mansfield' or the 'Company') is pleased to announce the results from a National Instrument 43-101 compliant pre-feasibility study (the 'Study') for its 100% owned Lindero gold project in Salta Province, Argentina. The Study was completed by AMEC Americas Limited ('AMEC') in association with American Au Ag Associates and Kappes Cassiday & Associates. The complete Study will be filed on SEDAR and the Company's website within 45 days of the issue of this press release. The Study contemplates conventional open pit mining operation and heap leach gold recovery. Over the initial three years of production 31.9 million tonnes of ore will be mined at an average grade of 0.81 grams/tonne containing 830,000 oz of gold. Leach kinetics provide for the recovery of 499,700 oz/gold in years 1-3 with the remaining 83,800 oz recovered as leaching proceeds based on a 70.31% recovery. Heap leaching over the first five years will produce an average of 161,000 ounces of gold at a cash cost of US$373 per ounce. Highlights of the project economic estimates are summarized below.