Queensland government's intense campaign for obtaining approval on two huge coal seam gas investments on the central part of the state paid off as the federal government gave its go signal on the projects but with substantial conditions.

Federal Environment Minister Tony Burke announced on Friday that the twin liquefied natural gas (LNG) explorations by Gladstone Liquefied Natural Gas by Santos Ltd and Queensland Curtis LNG by British Gas have been granted conditional approval by his office.

Speaking at a scheduled media conference in Canberra, Mr Burke said that the two LNG explorations gained government approval but must strictly adhere to hundreds of conditions set by the ministry to protect the Queensland environment from possible damages that the projects could deliver.

Mr Burke said that a total of 300 conditions must be complied with by the two companies as he stressed that it was decided that "these projects can go ahead without unacceptable impacts on matters protected under national environmental law."

In announcing his decision of granting the environmental approval, Mr Burke reiterated his ministry's emphasis that "we must protect the Great Artesian Basin, our threatened species, our waterways and the Great Barrier Reef."

The environment minister added that while the federal government gave its go ahead for the project, stakeholders to the billion-dollar project must take note that the "announcement involves more than 300 conditions which provide these environmental protections and allow the jobs and investment in Queensland to go ahead."

Recent developments in Queensland's coal seam gas explorations have led to mounting calls for a moratorium in the industry due to fears of toxic chemicals contaminations that many sectors deemed were too risky.

The state government dismissed the claims and argued that the identified risks were manageable as it stressed that the allure of the wide-ranging benefits for both Queensland and the federal government were too attractive to be passed up.