My purpose for visiting the Croft Mine had been was to photograph the fabled head frame – Ralph Schroetter, my guide at Coe Hill had said that it was one of the last such relics in the area. I soon came to realize that finding the abandoned structure would be no easy task. The forest was so thick that I could barely see twenty feet ahead.
I attempted to piece together the most likely location for a mining structure from the location of the dumps, adit, and the many overgrown tracks. Along one old bramble covered path I found a shelf system that had held the drill cores, along another track I found a collection of rusty old barrels. I spent some brief amount of time on the dumps looking for traces of the garnet bearing pegmatite. Mysterious, moss-covered beams were strewn everywhere. Might one of these heaps be the head frame that Ralph had spoken of?
Climbing the hill above the adit, I hoped to sight my goal, but I soon realized that I was out of luck. A yellow carpet stretched off bewilderingly in every direction. Breaking through the canopy was impossible. It was like I was drowning in an endless rain of sticky wet leaves. If it were not for the contour of the hillside, a factor that helped maintain my orientation, I doubt that I would have found my way back to the access track.
The water in the adit was knee-deep and crystal clear. I could see corrugations in the sand from big knobby tires. It seemed that somebody had driven an ATV into tunnel. Touching the wall I got an immediate whiff of the earth – it was that mouldering fungus smell you get when you dig in rotting leaves. Unlike the Richardson adit, there is no air movement here; it is absolutely still – like a mausoleum. Knowing the dangers of such an exploration I only stood in the entrance and though I had to fight my curiosity, I turned back for the fresher air of the forest outside.
Check out this rare earth mine near Bancroft – the shaft drops down to a depth of over 400 feet …. Here We found it in the bush by following the surface clues – a mine dump and old beams and tin.
Between 1953 and 1955 Croft Uranium Mines worked the area for radioactive minerals. They found betafite, uranite, uranothorite, allanite and pyrochlore. Their appearance is flagged in the pegmatite by a dark red color and quartz that has darkened to a grayish-black. There are also said to be small pink garnets in the gneiss and larger specimens in the pegmatite – some reaching up to 3 centimeters in diameter.
A couple of hundred meters along the mine road I got Maggie to pull over in a little clearing and I continued on foot, leaving her there with the understanding that I would be back as soon as I had found the mine and explored the dumps. She had Shaka with her for company and I had my whistle that I tooted on intermittently so as not to walk unexpectedly into a hunter’s ambush. The whistle also served the dual purpose of letting bears know of my presence as the bush was thick and close to the path and I had no wish to meet the “mother of all bears” in a circumstance of mutual surprise.
The road dropped steeply down into a valley and I soon realized that leaving the car above was a wise move. There was nowhere to turn around, the ruts got deeper, and the track was soon entirely underwater. Beavers had built a stick and mud palisade that held back a stinking organic tidal wave that would one day inundate the swamp below. As for the road, forget it. I climbed across on logs and waded knee-deep in mud, thinking what it might be like during bug season (What looks like a stream in front of the beaver dam is actually the mine road).
On the other side of the beaver dam the track began a slow and steady climb upward. I noticed the appearance of crushed granite where I walked and of course the telltale patches of eastern hemlock. These trees tend to grow in clusters wherever the natural forest has been disturbed. They tell you where to look for hidden human habitation.
I soon discovered the mine dumps on my left and in a marshy gully I unexpectedly found the adit.
See another abandoned uranium mine in Ontario … here or my trip to the Sarnac Zircon Mines … here (where we were again terrorized by the possibility of being eaten by bears
At first glance the Essonville Road Cut looked much like many others in the area – gnawed upon by rockhounds and strewn with shards of calcite and sand. Most immediately obvious were the huge black crystals that protruded from the calcite – a dyke that is theorized to run off into a southerly direction onto private property. A sign on the fence behind the cutting advertises “Rockhound Eco-tours”. A rockhound eco-tour? It almost seemed contradictory.
“You’re a rockhound?” I asked the fellow crossing the road from the pickup he had parked on the opposite shoulder – “You might say that”, I was told with a grin. “I am more a prospector and I operate the eco-tours – like to show the minerals on my property but we prefer not to set pick or hammer to them. We like to think of ourselves more as stewards”. “Stewards?” “Yeah, caring for the land. I know it sounds hokey, but I think we were meant to have our property – to look after it. Collecting can be destructive”.
I kind of edge my rock hammer around behind me. “Is there a problem with us collecting here I ask? Nah, its public land. Place is already trashed with all the blasting”.
In reverent terms Mark explained, what had formed in the cutting was Fluor-richterite. You will notice that some of the crystals have a metallic sheen – kind of stained by an iridescence, Its only a skin of goethite, beneath it is still fluor-richterite, one of the few minerals that can really be called “totally Canadian”. It was only distinguished from hornblende and recognized as a separate species in 1976”.
“So, in truth, you would have a hard time distinguishing between the two?” “Not really” my eco-teacher told me. “They are both amphiboles and they form a solid solution series, but fluor-richterite has a scaly white surface and it forms in prisms that are longer and thinner than those of hornblende”.
“Do you sell any specimens?” I ask hopefully. “How can you put a dollar value on them?” I am chastised.
As fortune would have it, I found myself in the company of Lee Clark later that afternoon. Having seen the township’s blasting Lee had asked for the debris to be dumped beside his barn; he had scooped the lion’s share – enormous boulders with fluor-richterite spines and as Lee pointed out hexagonally appearing prisms that cleave away in flakes. “phlogopite mica; they used it for windows in the old wood stoves.
Having weathered out of the calcite there were doubly terminated prisms lying amongst shards and unusually shaped prisms that appeared fully formed on the one edge and flattened on the other. I was in the process of trying to decide what unusual growth condition had so stunted the crystals when Lee apparently read my thoughts “The prisms frequently cleave down their center,” he slipped me a smaller perfectly formed specimen that he had been carrying in his pocket. “It’s my worry stone” he explained, “You take it; folks down south have greater use for that than I”.
If I was asked to pick one gem as my favorite, it would definitely be tourmaline. Look at these colors. These cabs are in a tray that was displayed by a merchant at the Bancroft Gemboree.
Red tourmalines are known as “rubellite”, one of the better known deposits being some 30 kilometers south east of Mogok in Burma where the gem is found in an alluvial bed of decomposing gneiss. Chinese miners generally worked this deposit as red tourmaline was needed for the buttons of mandarin’s gowns.
Well, Rockwatching has been up and running for a number of years now (5 to be exact) and I believe it has contributed significantly to the interest of people like myself who like caving, rocks, the outdoors, gems and minerals in Ontario.
We are just a few short days from 2011 and I believe it’s high time we made some resolutions -all of us (you my loyal fellow bloggers as well).
So in the interests of all involved a few ground rules to follow on Rockwatching from now on
1) Lets not carry a personal vendetta onto this site which is meant to be a forum where like minded enthusiasts can interact in a positive way.
2) Lets respect each other and try not to get personal when we are frustrated.
3) Lets respect the basics of conservation and eco-minded thought.
4) Lets not assume stuff we don’t know for sure (hence the survey at the bottom of the post).
5) Lets keep in mind that this is all about enjoyment.
6) Lets keep in mind that just because the topic is on the table, every single aspect that pertains to it is not an open book.
7) Lets respect people who are not on the site, private property, reputations etc. Just because there is discussion of a site or feature does not mean permission has been granted to go there.
8) Lets not get petty, self righteous or important. Stop correcting my grammar, spelling or use of terms. I am a writer at heart and so I believe I can use the language as I please (providing it’s in good taste, or if I choose, not in good taste).
9) Lets not waste my time by having to re-direct you to one of the above rules.
This picture was taken on a recent exploration that JC and I did in an area that has long been suspected of being “cave rich”.
In Ongley’s long forgotten cave manuscript he relates the impression at the time of Ontario being a cave desert – a paucity of karst! not so! Theres lots of caves in Ontario you just gotta find them. Marcus Buck said that 90 -95% of Ontario’s caves are found beside a road or path – still true, its because of our rugged terrain and people’s unwillingness to hack through the bush. JC and I do that quite often and sometimes we hit lucky.
My book on Ontario’s cave geography “Rockwatching” is again available at Amazon. It appears that it had risen quite significantly in price while it was out of print - Teebooks1 - $156.13, The_Meirin_USA – $94.00, and any_book for – $56.46.
Rockwatching is back on at Amazon for $20.96 – buy it and stop e-mailing me for directions to caves, you’ll learn in the book how to figure those out for yourselves.
But for now, I hope to update you in the next month or so on our further explorations of Broken Rowboat cave – it all depends on whether the location is totally snowed in for the winter or not. It’s a hike of several kilometers through some pretty rugged terrain.
The big passage in Broken Rowboat Cave ends in a jumble of rock leading downward at one end and a sediment blockage at the other end. The big passage is met about midway along by a crawl tube from the outside and another tube leads off from it that is blowing cold air.
Its kind of funny in a way as there is a worn depression in the dirt that leads from the outside, down the entry tube, into the big passage, and then down the passage that is blowing air – the depression is likely trodden by some little cave dwelling animal (porcupine, raccoon). I saw no scat or other clues around – maybe its gnomes!!!
Anyway, as the cave is not so far below the surface and yet quite heavily marked by large scallops, I wonder if the sediment blocked end had once taken running water from the surface. There are many large soil filled grykes in the around there.
In the above picture JC is investigating crevices in the area. We are wondering if there are other entrances. The cave must go downward as because of the topography the tunnels can’t be too extensive at the level that we were exploring.
Downward would seem a likely possibility for several reasons – one is that at one end of the big passage there already is a rubbly pit in that direction, secondly, because water flows downward, thirdly, because the joints in this area are especially wide – so why not deep as well? And also because it would seem a logical route for the water to flow as there seems to be obstructions on the surface that might make it the most logical route to follow.
I suppose the tube that is blowing cold air will reveal to us whether our exploration will continue, or whether it will stop right there with the usual crushed expectations. I suppose we can’t complain, if every hill had a cave beneath it – well looking for caves wouldn’t be quite so rewarding.
Following the release some time ago of my book "Rockwatching; Adventures above and below Ontario", I am pleased to announce the release of my new book "Tamarindo; Crooked Times in Costa Rica". It is a story of opportunity. Edgehill Press is the publisher. (www.edgehillpress.com)