What is it cowboy? looks similar to some of the stuff I cut yesterday.
G'day BFS, that's all peppermint I've been cutting. Mostly broad leaf, some narrow. That big round of yours does look a bit like narrow leaf peppermint with the Milo colour and sap veins but really could be anything. Dry wood can be hard to pick. Don't think you'd 15 hours burn time out of peppermint though.
What nearly killed you? Falling tree? I would have gone for drop bear but they normally only target Americans. Stay safe.