Police have visited the site this morning and said they currently had no concerns.
"However, should any issue arise, police will deal with it as appropriate at the time,'' a police spokeswoman said.
The owner of the property was on board with the group's demonstration and had given them his full support.
"We've been given this piece of ground now until this is sorted out. So [Solid Energy will] be trespassing on our property if they go across the line.''
Monk said he and other representatives of the families would be going to Wellington tomorrow, in a bid to get their message across to Government.
"I'll be flying up tonight along with four other members of the families. We're going to be standing on the steps of Parliament.
"We're wanting an audience with the Prime Minister, if we can get one. We're going to present a plan to the Prime Minister that our experts have put in place over this short time and I just admire them so much - they've gone out of their way to do this.
"I also would like to take the opportunity of asking people if they can be on the steps of Parliament at 12 o'clock tomorrow.''