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Archive for the ‘rockhounding in Ontario’ Category

Tunnel Dive in Ontario

Tunnel Dive in Ontario - Ontario Caving

Tunnel Dive in Ontario – Ontario Caving – a bubbling resurgence

I took today off from my normal routine as of late (which is posting on the Edgehill Press site in support of my new book, “Tamarindo; Crooked Times in Costa Rica“, it is a work of fiction about 3 unlikely heroes in Costa Rica who by various underhanded ways achieve some measure of success in the surfer town of Tamarindo). Instead I went out looking for caves so as to prepare for my usual summer of assorted caving explorations.

Our initial leads fell short today. We spent some time near Short Hills Provincial park investigating a rumor, as we were unsuccessful JC and I visited this spot out in the forest hoping to find other sinkholes. There are several other similar pools beside a river that runs along the edge of farmland. This spot was located by an associate who was using aerial photographs.

The pools bubble in the spring – and after a rainstorm they boil like a kettle. Though the nearby stream entirely sinks about 500 meters upstream and then resurges 50 meters away there is apparently no connection to the water that is bubbling out here.

Some years ago, in an effort to trace the source, two friends of mine dug out a fair bit of rock (the pool is about waist deep) and then one of them wiggled up a pheratic tube for about 200 feet. There was some obstruction at that point and he had to turn back. You will notice that the water is milky with the clayish soil from nearby fields. In exploring the underwater tunnel it was done entirely by feel, and I would imagine – pushing the tank along in front.

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Beneath Robillard Mountain

Craigmont is about as distant from the reach of the modern world as you are likely to get in the “near north”. Indeed it appears on the map as a substantial settlement but as you cruise up Boulter road you become aware of how far you really are, both geographically and culturally from the bustle of Southern Ontario.

Coasting over hills that stretch off greenish-blue into the summer haze it seems as though you are crossing into a time warp. Meadows are saturated with intense colour and high pastoral fields line the road, strewn with orange and yellow flowers. Beyond this lies the valley of the “Little Mississippi River”. Spike-topped conifers wander unbroken to the horizon and in hillside fields lazy cows watch disinterestedly at the crumbling demise of old log barns.

As a collecting locale, Craigmont is remarkable. Not only is the beauty unsurpassed but its minerals are spectacular. Corundum here is found in large euhedral (perfectly formed) specimens; lapidaries have been known to cut them into cabochons. In their book, “Rocks and Minerals of Ontario” the Ontario Department of Mines say that there are unusual curved mica crystals. Garnets, molybdenite, allanite, uranite, euxenite, magnetite, pyrite and hornblende also appear from time to time.

Blink and you just might glide past Craigmont. The inhabited part is now a private town. It exists as a cluster of houses, barns and sheds and around it the vegetables flourish in earthy rows.

Robillard Mountain is situated within sight of the present habitation; an impressive upheaval of rugged red rock. Some twenty separate excavations scar its slopes.

As a general rule most corundum is found in pegmatites and structures associated with nepheline syenites. In this area north of Bancroft the most abundant deposits (corundum) are said to be sandwiched between scapolite, nepheline andesine and a band of alkaline syenite.

I took a hike beneath the mountain to see the syenite from below.

More on corundum in Craigmont here …

Check out this abandoned mine in Cobalt ... Here

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James examines the diamond bearing Breccia – Cobalt

Ontario’s first really big diamond was discovered in 1906. Father Paradis, a missionary in the Nipissing district, reported that he had found a 101 carat yellow diamond in glacial overburden; the stone was said to have a rough exterior and be about the size of a hen’s egg. Most surmise that the gem had been picked up somewhere near the father’s mission along the shores of Lake Timiskaming; it was auctioned at Tiffanies and has since disappeared below the radar.

Few should be surprised at the discovery of gems in Canada. For over thirty years now geologists have known that diamonds are associated with continental cratons. The Canadian Shield is but one of several cratons in the north; it is the largest such structure in the world.

The discovery and subsequent mining of diamonds just outside Yellowknife precipitated a wholesale mineralogical scramble. In recent years the search has moved in a southerly direction and it will continue right across the Shield until its rock dips down under the soil about an hour’s drive just north-east of Toronto.

Just recently there have been some astounding discoveries outside New Liskeard. Several kimberlite pipes were found and at least half of them are diamondiferous. Though diamonds are typically found in kimberlite these New Liskeard diamonds are embedded in the breccia along the side of highway 11 (above photo).

Ralph Schroetter, a local gemologist hunts for New Liskeard’s illusive crystals at night, in a nearby stream bed; he uses ultra violet light. As he explained, “Some diamonds fluoresce when exposed to that kind of stimulation. It makes them easier to spot”.

Check out the big chunk of raw silver that I found on the mine dumps in Cobalt – here (raw silver)

Check out the dirty world of blood diamonds here ….

And on the other hand as Shirley Bassey sees it – out of the mud and on to the finger …  Diamonds are Forever

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Abandoned Ontario Mine – Croft Mine

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.

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Finding the Croft Uranium Mine – Ontario

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

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Fluor-richterite – Rockhound in Bancroft Ontario

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”.

Check out my visit to Princess Sodalite mine here …

Check out the Richardson Fission Mine here … Richardson Fission Mine

Check out abandoned silver Mine in Northern Ontario here … Abandoned Silver mine

Collecting apatite in Bancroft here … Apatite in Bancroft

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Tourmaline – Bancroft Gemboree

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.

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