A group of mining investors including an envoy were on Wednesday denied access to the limestone-rich Ngaie Hill in Kyuso district, Kitui county.
A group of youth who were said to be armed with machetes and sticks used thorny bushes to block the convoy's way.
The group was driving in a car with private registration plates.
Mike Muli who was part of the team, the group said was visiting a 100-acre plot whose owner Muithya Musyoka, was willing to sell at Sh300,000 an acre.
"Since Musyoka land is within the limestone rich area, we were surprised when our way was blocked by youths who were armed with pangas and sticks. We had no choice but to turn back," he said.
He said the team that included a Nairobi lawyer, did not protest the residents' action.
Kyuso deputy county commissioner Peter Maina said he was aware Ngaie residents sent away mineral prospectors who had attempted to enter the limestone area unannounced.
He however denied knowledge of their identities.
"I do not have a detailed account of what exactly happened. I was not even aware of any ambassador coming to my area," Maina said on the phone yesterday.