Landowners will hang large signs at their gates, saying a person's right to enter is "expressly withdrawn".

It's the latest move in an escalating community campaign against the miner's 15-hole drilling program and long-term plans to start a mine.

At a meeting last Tuesday, Moorabool Environment Group joined forces with the Lock the Gate Alliance, a nationwide anti-mining movement which promotes the display of signs.

Lock the Gate has spearheaded a major campaign in Queensland and NSW to stop the expansion of the coal-seam gas industry.

The decision to join the movement followed Mantle Mining's announcement to the stock exchange that preliminary coal tests from two bore holes in the area had exceeded expectations.

Moorabool Environment Group secretary Deb Porter said the signs would send a message to miners that they weren't welcome.

"It's a law in relation to trespass. In other parts of Australia, now that people are displaying these signs, miners are going right past these properties and looking for properties that don't have them," she said.

Ms Porter said the move had received widespread support from residents who attended last week's public meeting, with many saying they wanted to display the signs.

While Mantle was not searching for coal seam gas, Moorabool residents shared concerns about protecting water systems, agricultural land and bushland, she said.

Lock the Gate president Drew Hutton said it was important for residents living within exploration licence areas to act early.

"If you wait for the environmental impact assessment to begin, you've already lost."

Mr Hutton said "locking the gates" was most effective when entire communities hung the signs.

"Community solidarity is important. Don't just put it on your own fence; talk to your neighbour."