The phrase "a proposed pit" is correct and usable in written English.
It can be used in contexts where you are discussing a suggestion or plan for a pit, such as in construction, mining, or environmental studies.
Example: "The engineers submitted a report detailing a proposed pit for the new excavation site."
Alternatives: "an intended pit" or "a suggested pit".
Three years previously, in February 1981, the government had retreated from confrontation over proposed pit closures, considered necessary in the face of operating losses, by some reckonings, of just over £3 per tonne of coal, and a sale price 25 per cent above the international market rate.
In the past month, two cities near Denver have also proposed pit bull bans.
Gallamini et al (2004) proposed PIT, the Prognosis Index for peripheral T-cell lymphoma, unspecified (PTCL-U) to identify different outcomes of PTCL-U.
Pitting behavior due to the MFG was explained through a proposed dominant pit concept.
Like other realists, such as Frank Norris whose novels The Octopus (1901) and The Pit (1903) began a proposed "epic of the wheat" trilogy, Sinclair used characters as ciphers or vessels for the sweeping forces of social and economic history.
Last month, the government called off a $1.4 billion coal project agreed with a British-based company, Asia Energy, after the police had shot dead at least five demonstrators at the site of a proposed open-pit mine in north-western Bangladesh.
Political scandals contributed to that decline, as did disenchantment with Humala's handling of social conflicts, especially the clashes between environmentalists and mining interests, most notably over a proposed open-pit coal mine in the Cajamarca region of northern Andean Peru.
And when the Parish Council met on a proposed moratorium on new borrow pits last October 10, it received an Army Corps statement saying that existing borrow pits already met the needs of federal and non-federal levee projects in the parish.
Simply put, the debate between Mayor Bloomberg and Gov. George E. Pataki over a proposed $1.4 billion tax on commuters pits a mayor who wants to spare New York City residents some of the cost of city services against a governor who simply abhors taxes.
A second public hearing on a proposed helicopter pad that has pitted the Security Pacific National Bank Operations Center against neighboring residents is scheduled for Tuesday night.
