The announcement was made after market hours on Wednesday, 8 February 2012.
Meanwhile, the BSE Sensex was down 80.81 points, or 0.46%, to 17,626.51.
On BSE, 4.26 lakh shares were traded in the counter as against an average daily volume of 55,440 shares in the past one quarter.
The stock hit a high of Rs 17.50 and a low of Rs 15.80 so far during the day. The stock had hit a 52-week low of Rs 9.21 on 20 December 2011. The stock had hit a 52-week high of Rs 23.90 on 13 April 2011.
The stock had outperformed the market over the past one month until 8 February 2012, gaining 26.86% compared with the Sensex's 11.73% rise. The scrip had also outperformed the market in past one quarter, rising 8.49% as against 0.78% rise in the Sensex.
The mid-cap construction company has an equity capital of Rs 145.75 crore. Face value per share is Rs 2.
The project cost as estimated by NHAI is Rs 1684 crore, the company said, adding that the project will be built on design, build, finance, operate and transfer basis. The company will pay a premium of Rs 57.57 crore per annum for the concession period, it said. The concession period of the project is 30 years including a construction period of 2.5 years, it added.
On a consolidated basis, Gammon Infrastructure Projects reported a net loss of Rs 8.96 crore in Q2 September 2011 compared with a net profit of Rs 3.04 crore in Q2 September 2010. Net sales rose 13.7% to Rs 89.58 crore in Q2 September 2011 over Q2 September 2010.
Gammon Infrastructure Projects is an infrastructure project development company incorporated by Gammon India to participate in the development of infrastructure projects on a public private partnership (PPP) basis.