Welcome to the Forum.
The Fish could be correctly identified only when you catch it and share the photograph. However, since you mention two distinct colours, namely Orange and greenish and as the two pictures show a distinct Orange colour on its chest or lower front side with dorsal surface grey or greenish, I would not be surprised if the fish is a 'Piranha'.
To justify my above guess I would like to share an interesting incident in which my brother-in-law was bitten by a fish none other than a 'Piranha'.
In last November, my brother-in-law visited his Friend's Farm in Raigad district, where the Farm owner had created a man made Pond and had introduced 'Calcutta fish' (Rohu, Catla, mrigal and other carps). Unfortunately, in last monsoon the pond developed a bottom leak and most of the water got drained. The Farm Owner had therefore decided to net all remaining fish on that day. The water in the pond was very muddy and it was hardly 3 to 4 feet deep. My Brother-in -law had no hopes of netting any fish in such a muddy and shallow water.
However, when the net was hauled, to his surprise it had 8 to 10 pomphret sized piranhas! He held one piranha in his hand and wanted to photograph its human-like teeth, when the piranha quickly bit his finger and inflicted a deep bleeding cut !. The Farm Owner reported that this fish is named Fresh water pomphret and fetches him a good price as it is very tasty. He prepared a Fish Curry of these Piranhas and my Brother-in-law told me that it was really a tasty fish!
The important fact that the above incident indicates is that this South American Piranha fish is getting introduced in our Indian waters and this could harm the aqua culture in our country.
I understand that these piranhas are available in Aquarium shops as well and somehow they find their way into the Pisciculture industry, which is dangerous to other species like Rohu, Catla, Mrigal and other indian carps.
Wish you Best of Luck in catching your elusive Fish from the quarry and looking forward to see its photograph.
wonder why the bugger who released piranhas did not release peacock bass while he was at it ?
would have been more appreciated than those scalpels.