The phrase "a key resource for" is correct and usable in written English.
It can be used when referring to something that is essential or important for a particular purpose or group.
Example: "The library serves as a key resource for students conducting research."
Alternatives: "an essential asset for" or "a vital tool for".
Census data are released publicly after a century, and are a key resource for people researching family trees.
We can gain unique insight by looking at the latest wave of the British Election Study, a key resource for academics who study elections.
In 1870, a new copyright law made it a national depository, and it soon became a key resource for scholars and the home of the U.S. Copyright Office.
"Water is a key resource for H&M, and we are committed to ensuring water is used responsibly throughout our value chain.
The Scottish journey was also notable for Jonson's climactic meeting with William Drummond, whose jottings from the conversations they had have been a key resource for scholars, but in some ways a dubious and misleading one, as Donaldson convincingly argues.
Andy Mitchell, Facebook's director of news and global media partnerships, said, "In Storyful, we're excited to have found a partner with a track record of understanding both the potential of the social web as a key resource for media as well as the tools that newsrooms need to utilise it".
Helium is a key resource for many high-tech applications.
We trust that DSE will become a key resource for researchers in China and abroad.
Under this assumption, a reconfiguration tool is a key resource for the planning and the operation of MV distribution networks.
At the National Institute of Environmental Health Sciences (NIEHS) in North Carolina, a key resource for the career fairs are the associates at the North Carolina Biotechnology Center.
The conservation of species-rich grasslands and their associated microbial diversity could therefore be a key resource for sustainable agriculture in the future.
