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Modeling the Gilpin Tram Part II
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 Posted: Thu Oct 27th, 2016 06:47 pm
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Monte
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Keith, An other great posting, this last week on the trip to Gilpin County with the Denver Gang, we were in the area of the Hidden Treasure. later in the day we ended up at the Grand Army. It is getting closer to becoming a very large pile of rocks. Will send you some photos. if you need more photos of the Polar Star i can supply.

Keep up the great work. later..

Monte



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 Posted: Fri Oct 28th, 2016 01:32 am
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Chriss H
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Thanks for that Keith! Barry just replied to me that he still has some early small cars left over, I'm ordering a six pack or them.

And to top that off I just bought my first HOn3 Shay to pull them with. Can't wait to get it. I know it's not quite the prototype model, but finding a nice running Shay in HOn3 with detail like this for under $300 shipped, I couldn't say no. :)

Attachment: IMG_0180.JPG (Downloaded 156 times)

Last edited on Fri Oct 28th, 2016 06:04 am by Chriss H



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I'm a Colorado mining district afficianado. Planning a layout in HOn3 based on the Gilpin County area.
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 Posted: Fri Oct 28th, 2016 05:46 pm
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Salada
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Herb Kephart wrote:
Can't begin to imagine the noise level with all those stamps running. Probably yelling into someones ear wouldn't work, Working in there must have been painful--and destructive to hearing very quickly.

Herb


Yes indeed. Even just a single 5 head on fairly soft semi-rotten granite can be heard all over the mine but it's not a piercing sound like a firearm, more a rumbling heavy thump.

Regards, Michael

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 Posted: Fri Oct 28th, 2016 05:59 pm
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Salada
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Yes please Keith, as much excruciating detail as you can manage.
Stamp head drop rates & heights, ore feed rates, average stamp head wear rates, gpm water feed rates over the tables, in mortar box amalgamation vs table amalgamation results. All the usual simple stuff a miner needs to know !

Great subject, thanks Keith. Regards, Michael

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 Posted: Sat Oct 29th, 2016 02:30 am
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Chriss H
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Salada, the book Keith mentioned and I posted a link here (this thread on Oct, 25) has a lot of this very information. One thing I'm learning is the stamp mills in Gilpin county were slow drop vs. the California method of speedy stamping, the ore in Colorado was amalgamated with a lot of different minerals and hence quite hard to get a good percentage of gold out, until the mining engineers figured out how to slow the stamps down, and use direct quicksilver methods as soon as they crushed the ore finely in the mortar box, to eventually end up with around a 70-74% recovery rate, equaling California's best averages of recovery. In the earlier days of hard rock mining they were stuck at around 40-50% recovery rates, making it almost not worth the effort of digging so deep and hauling the ore out to process.

I'm sure learning a lot about early days of hard rock mining lately.



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 Posted: Wed Nov 2nd, 2016 03:39 am
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Keith Pashina
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Michael,

Rickard's book that Chriss mentioned is a great reference, and I recommend tracking it down. I'll post some information gleaned from that book, and a few other references about milling. This will be an opportunity to either dazzle you with my brilliance, or baffle you with B.S.!  I'm not a mining engineer, and have no connection to that industry, so my interpretations are definitely that of a hobbyist.


DIRE STRAITS!

 

100 years ago today, business was not very good for the Gilpin Tram. This once-prosperous two-footer used to make its owners a profit each year, but those days were fast disappearing. 

 
Whereas 1913 saw a small surplus revenue of $10,238, 1914 was an ominous year – the tramway lost $9,750 on its operations. The troubling trend continued into 1915 – the tramway lost $10,437 that year.  1916 was looking worse yet! 

The prospects for any increase in traffic were none too good, either. By 1916, only the Polar Star Mill in Black Hawk was custom treating ores on a regular basis. Ongoing expansion by the Newhouse Tunnel (which exited over in Idaho Springs, and we know it today as the Argo Tunnel) was now taking over more and more ore haulage from the producing mines in the district. Already, the tunnel had tapped former major shippers on the tramway, such as the Frontenac, Aduddell, Saratoga, Old Town, and others, with more mines being reached each year.
 




What had started out as a European war in 1914 precipitously grown, and now seemingly engulfed the whole world. This impacted mining operations, too. Mining production had started a gradual decline in 1904, and dropped off alarmingly in 1914:
 
Year     Mine Production
1904    $1,707,257
1905    $1,764,283
1906    $1,435,842
1907    $1,283,855
1912    $1,330,796
1913    $1,035,746
1914    $  770,655
1915    $  709,605
1916    $  723,146
 
Bondholders were getting impatient – payments on the bonds were coming due, and where was this money going to come from?
 
So, what will happen to the Gilpin Railroad? Will it survive? Will there be a surge of new traffic and opening of new mines? Time will tell…[url=javascript:emoticon(':bang:', 'images/emoticons/banghead_125.gif')]document.write('[/url]');


Keith




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 Posted: Thu Nov 3rd, 2016 05:36 pm
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Salada
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Thanks Chriss and Keith, from that Internet link it looks as though the book can be downloaded direct, without hunting through lots of obscure book dealers ?

I have a professional/amateur interest as we run our own stamps but nowadays it is almost impossible to find any practical advice, rules etc as to how to actually set up and operate a set. From personal experience there are so many variables, from water flow rate through the 'box' to stamp head (shoe) weight, drop etc. , all of which have an obvious effect on ore particle size and recovery rates. Drop rate is not easily varied because any change of pulley size will often require a different length or altered drive belt (not cheap these days !) and slowing down some prime movers such as water power is much easier said than done without losing Hp. Simultaneous winding and stamping off the same water power source is interesting !

Amalgamation stamping is a total unknown to me as we have never had much gold mining in the UK. The only cyaniding plant I have ever seen is in Spain or the U.S. - so the more detail the better !

Regards, Michael

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 Posted: Fri Nov 25th, 2016 04:53 am
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Keith Pashina
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Thanksgiving Day is almost over, and I have had a lot to be thankful for. I just got home from a busy day of visiting with family and friends, and popped into my hobby room. I have a lot to be thankful for with model railroading - meeting many friends online at FreeRails, seeing others at local and national narrow gauge gatherings, getting together with other friends in the hobby.

Life has kept me pretty busy the past several weeks, but I did manage to get some of my newer modular sections mated with two of the older sections from the layout from my last house. This gives me a current L-shaped layout, about 6' x 8'. The current setup is very simple - spurs to 6 mines and a runaround track.



The left end is going into Black Hawk, which I am still researching and planning. The right side will go to a fiddle yard, and may be extended across a door and on to the other wall someday.

Keith

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 Posted: Fri Nov 25th, 2016 05:20 am
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Si.
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Hi Keith :wave:

The setup looks AWESOME !

Somehow, even from a distance you can see how cool the terrain is !

I love your benchwork edge.
One of the 'wobbleyest' I've ever seen...
...I like it, makes the relationship to the shelf look really natural & random somehow.

Roll on Black Hawk !!

:moose:

Si.



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 Posted: Fri Nov 25th, 2016 06:29 pm
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Herb Kephart
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Keith
Great that were able to extend the layout--but how can you get anything done with those clean, neat work surfaces?

Herb ;)



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