UNI'""R 9\kSTATES VANADIUM CORPORATION

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UNI'""R 9\kSTATES VANADIUM CORPORATION

DEPARTMENT

CERTIFICATE OF ANALYSIS

To Mr. Geo. J. Banaroft, 214 Broadway,

Denver, Colo.

Rille, Colorado, JlIl)' 2, .1936.

The Sample of Qonaentrates ^Shipped

From Mr. Banaroft ^{Our No. _}

Marked

t

1st ccnc , fJ1t1At ~" A;(. ,t.

Containa:

Cb205 plus Ta205 --- None.

'1UJ/

This aoncentrate contains 59

%

also slightly Tltaniferous. Neither the Magnetia or Non-Magnetic portions, tested separately, show at any stage of the analysis any of the aharacteristics of Cb or Ta bearing mat.erial.

tIC

It 5 Refunded.

CHIEF CHEMIST

Denver, Colo r ad o , July 6, 1936.

Kr.Georg3 Bancroft, 214 Br o arway , Denver,Colo.

I have c onpLeted t.he analysis on ta r e e oon o en , r te s ubro it oed to me June 12, 193r,. rhe five f'us ion s submitted to me t h: s ame day lIed been heated to such a te~)er~ tu"e as to rupture; the crucible in wnich the fusion had been made c,t1d the sodium hydroxide flux had e2C )ed into the clay crucible whtc h surrounded the iron crucible. The resultant

mass was not solulle, in as much as it cont ••inad no free al~Rli. These fusions were allowed ~~ 1:3(0;1 ~'or48 hourr. At the enj of tn t time

ions fr o:n c c n c e n tr-a te s number one and t\70, and analyzed tn e sa co n c en- trates for tantalum an d columbium. Number three concentrate was co e ck- e d quali tat ive Iy for tantalum and quanti ta tiv e Iy for COllmlJium and zir- conium. The r e su Lt s of these determinations are as follows:

No.1 No. 2 No. 3

Ta205 15.4 .; ^2,~,u none

Cb,i;°5 1.3,; 7 .2^jb ^•g;~

Zr02 16:;

The tantalum and columbium p e r c encug e s shown for concentrates num- ber one and two are the .ne.,n of three dete rmⁱnu ^tio .s , The number Lwo

masks the c o Lurnbium dete rmi n t ic n , an. in t.he event of c ommrr cia.L production of concentrates similar to those subnitted it wOlld be my r-e oommcnda^tion tlF t the mumber- two c on oentr a^te be wi thh:dd from s;lii^J- me n^t until [, tho co ug h exa~in'.ti~n can be made of Lv, as it may con tain

some e Lemer:^G of comrner-cia.L interest. Also, ttl', r cia of tan tsLum ^"0 col- umbium in :llis c on c ar; trb te does not mn': e it; particularly attractive to

snip for its tan trclum va Lue ,

-2-

The ratio of tanta.Lum to c oLumb.rum in the nwnber one concen Crate is the most attractive that I have seen outside of the Australian tan- taliteo IlesJito the r-at.h er low J8rcentage of tantalum in this concentrate.

its ratio to colwnbiwn m&~es it commercially valuable and the Jroblem of getting the percentage higher can be dealt witn from a purely mech- anical 3.JJroL.ch. The chemical ratio is such that a market should be assured.

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@eorge ^;jj.2J;ancroft

MINING ENGINEER

a ....NcFlOFT BL.OCK

214 BROADWAY

DENVER, - COLO.

November 11, 1936

Mr. James B. Grant,

First National Bank Bldg., Denver, Colorado.

Dear Jim:

As one way to divide. the 9.544 acre tract, I suggest an exchange of deeds, you taking the Easterly 6 acres and I the Westerly 3.544 acres.

I enclose a blue print which shows the various points of interest. This division gives you .68 9f an acre less land than your .70 ownership calls for. Enclosed

is check for $68.00 being at the rate of $100.00 per acre.

I have several hundred acres of similar land which I will sell for $75.00 per acre. so this seems to me a fair price.

If this plan suits you. the enclosed description will help in preparing the deeds.

In addition to the exchange of deeds and in view of my plans for marketing the Black Rock I think there should be an agreement, either written into the deeds or supplemental thereto along the following lines.

1st. That I wIll not remove any rock which will disturb your surface rights.

2nd. That you recognize my mineral rights to the Black Rock under your 6 acres in such manner as to remove the possibility of competition from that source.

In this connection I quote th& mineral reservation in the U, S. patent, "Subject to the right of the propritor of a vein or lode to extract and remove his ore therefrom should the same be found to penetrate or intersect the premises hereby granted as provided by law".

The above plan is merely one of many plans that would be acceptable to me. Another plan would be along the lines of a trade.

I have some buildings and some very beautiful building sites. It is true that I have no such view of the prairie as this tract, but you can always enjoy the view by taking a ten minute ride in your car. Ownership

is not necessary to the enjoyment of the view and there

are many other factors about this tract which are undesirable.

My ground, on the other hand. is very useful and aooessible.

suit you. In any event, please let me know what plan wi 11 Sinoerely.

George J. Banoroft.

· Mr. Geo. J. Bancroft.

214 Broadway.

DEi~VER.

WEST FIFTIETH AVENUE AND LOWELL BOULEVARD

DENVER, COLORADO. Jan. 9th •. 1937.

My Deal' Mr. Bancroft ,

~t the time th~t you Phoned to me I was taken by surprise and W3S not pre~

.pared to make any.new statement. 3ince than.howe.3~ I went ,OVBr the work once ,more. I regret I aT unable to change the substance of my previous statements.

I fail to discover in the sample any evidence ,of Golombium, Tantalum or Chro~:

mium. All I can ,find is good tr~ces of Titaniu. aftsr tne Iron is removed.

Assuring you of the true interest I take in your ~ork and with sincere grat~- tude for your kindness and generosity to me, ,I remain, My Dear Mr. Erancnoft,

Yours very faithfully,

Prof. Coelh.

,.•:"$:

~bruary 10. 1937

"

BeImont Sme1ti!lei & Reft ning 11"o'rks ,Inc••

316 Belmont Avo ••

Brooklyn. n, Y.

Gentleme n: Att~ntton Alfred Ban~ltz.,

I have on hand about a ton of cone~ntratGS containing about ~enty·six p~ro~nt rare

earths. mostly oerium. It also oontains about one ounae of paladium or rhodium.

<,.{

Do you buy oros of this elase?

samples if you are interooted.

Will send

GJB/rm Sinoerely.

COLORADO SCHOOL OF MINES

EXPERIMENTAL ORE DRESSING AND METALLURGICAL PLANT

A.J.WEINIG. DIReCTOR, H. F. LUNT, AssOCIATe DIRECTOR

__~;I,_!__l'!!'.2_a_<!,\v"x. , _ Record N o. :l~_~ _

De11v':E-, ~~_~_o_~ _

Dear Sir:

Your ltlark

The sample__!> which you sent us ha'i_e been examined and tested with the following results:

Non-Magnet c

Magnetic Chiefly Magnetite. ',UQ tantalum, columbium or

A

See Referenee

Below

Silicate and l!'erromagnesian/Minerals.

~uartz, Feldspar, Biotite columbiwn, or platinwn. •

l,No Tantalwn,

. . . . . . . . . . . .

platinum ••

. . . . . . . .

REFERENCES: A-Sample has no commercial value; that is there is no open market for it, or it is too low grade to pay for production and marketing,

B-Sample might have ecmmerelal value if in very large quantity under extremely favorable conditions.

C-Sample might have commercial value if in sufficient quantity to justify a local treatment plant.

D-Sample has eemmerctar value in crude state under ordinary mining conditions.

NOTE: \Vhether or not a mineral deposit bas commercial value is an Involved economic problem. The principal factors which must be eonsldered are: grade of ore. eharecter of ore as it affects cost and method' of treatment, size and charaeter of deposit, location of deposit with respect to markets for the ore or its products, and' local conditions affecting cost of mining and treatment. In the (lase of non-metallic minerals and rarer metals marketing is usually more important than mining.

\Vhether there is a demand for the product, or whether a demand can be created, at a price which will insure profitable operation must be investigat-ed. Sometimes local conditions give a mineral deposit, such, for instance, as a gravel bani" considerable commercial value where ordinarily and' intrinsicaU)' the material is worthless.

Yours very truly,

NOTE: If this report (loes not tell wnat yoU want to kno'W about the san,ples, or Is not plain. please do not hesitate to write for further information.

COLORADO SCHOOL OF MINES

EXPERIMENTAL PLANT

BY__ ~~ _

CHARLES ENGELnARD'p~~ PENT

28

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NEW YO~'1;)' ICE GHARJ~.E#NGELHARD

'30 CHQYCH STREET

CLARENCE BLAIR MITCIT:ELL,vICE: PRESIDENT

GOLD-SILVER-PLATINUM-GOPPER

IRVINGTON} NEW .JERSEY

CABLE ADDRESS GLOSMELTER

IRV!NGTON,N.J.

March 9, 1937.

Mr. Geo. ~. Bancroft, 214 Broadway,

Denver, Colo.

Dear Sir:

With reference to your samples of Concentrates, Which you sent to us as per your letter of February 20th, we wish to state that our assay shows no precious metal contents.

Yours very truly,

IRVINn~'~-~EFINING WORKS

--:::7:

GC

(ENGELHRRD)

Beginning at a point on the North boundary of Seotion 8.

township 5 South. Range 70 West of the 6th P. M., whenoe the Northeast corner of said Seotion 8 bears Easterly 500 feet.

thence North 89° 24' West. 603.35 ft •• thence South 36° 271 East, 227.11 feet. thenoe South 650 39' east 214.78 feet.

thence South 51° 351 East. 154.54 feet, thenoe South 620 38' East, 174.76 feet, thenoe due north 440 feet. more or less, to the plaoe of beginning, embraoing 3.544 acres more or less.

together with right of way thereto on road as now built.

reserving. however, all rights of way for roads or pole lines heretofore granted.

Beginning at the Northeast corner of Section 8 township 5 South, Range 70 West of the 6th P. M., thence South 00 45' West 596.72 feet to the Southeast corner of this tract of land,

thence North 630 44' West 99.26 ft., thence North 750 34' West, 125.4 ft., thence south 860 43' West 103.42 feet, thence North 620 42' West 198.49 feet, thence due North about 440 ft., to a point on the North boundary of said section 8, thence South

890 24' East 500 feet along said North boundary to the place of beginning, embracing 6 acres, more or less, together With right of way thereto on road as now bUilt, reserving however all rights of way for roads or pole lines heretofore granted.

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1:: AFFIDAVIT OF LABOR AND

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Filed for record this .

By .

Deputy.

~'ees,$. ... ..__.

EXAMINEO

•

*Looe or Placer.

6-36 THe BRAOFQRO_ROB'NSON PTG. co., O.NOE"

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No. 164. AFFIDAVIT OF VALUE OF LABOR AND IMPROVEl\lIENTS.

-The Bradford-Robinson Ptg. Co" Mfrs. of Robinson's Legal Blanks, Denver.

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situated in _ __ _ __ __.__ .._ _..Mining District, County of

..., State of.~ : , as recorded in bookS 9:", page.S ..a,tJ.zI:J(1~l.-tt~:Id"

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BEFORE ME, the snbscriber, personally appeared .~ .

-.--- --..--- -- - ---- ---- ---.- - _ , who being duly sworn, saith that at least

..~ ^. ...dollars' worth of work or

improvements were performed or made upon the. . _ _.~ _

...County, such expenditure made by or at the expense of

..._._ _ ._ _ _ _ _ _.__ _ _ owner_ of said claim..__ , for the year

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Such expend~::t~:lade between

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RESEARCH <...rlEMISTS METALLURGISTS

Rendering a Complete Mining Service

HARRISON ENGINEERING CO.

"HARRISON CHEMICAL PROCESS"

Head Office and L.borawrIl' 2222 Broadway DENVER, COLO,

(990/0 PIll' Gold Recoc>ergJ

DON 1.CAMERON

November 3, 1937 ^Canedien Repre ..el1lalilJe 6th Floo•. Somer~et Building

WINNIPEG. MAN.

Lenix,

oli~QbI?, ~~¥eC?,Vciln',.,cFoEPORT

F=========1"==¹

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Mr. J. H.

SAMPLE NUMBER AMOUNT OF ORE USED AMOUNT OF GOLD OBTAINED OZ. PER TON

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Your Black Ore 1 lb. ueed Recovered

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CHEMIST

"Harrison Chemical Assays Me representative results o[ the gold or other metals that can be recovered under commercial operation! with the Harrison Chemical Process"

RESEARCH CHEMISTS METALLURGISTS

Rendering a Complete Mining Service

HARRISON ENGINEERING CO.

"HARRISON CHEMICAL PROCESS"

Hl':ad Offlcl': lind L.borIlWrp:

2222 Broadway DENVER, COW.

(990/0 PluJ Gold Rt:Covl':tll)

DON I. CAMERON

November 4, 1937

SAMPLE NUMBER AMOUNT OF ORE USED

... ···1···I I

Canltdian Repte$e,<tative 6th Floor. Somerset Buildtng

WINNIPEG. MAN.

AMOUNT OF GOLD OBTAINED

···1···· .

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... ··· .. 1

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Our :!S2

Your Plack Ore I lb. used Recovered

CHEMIST

"Hamson Chemical Assays are reptesenuaioe results 01the gold or other metals that can be recovered under commercial operations with the Harrison Chemical PrOCe38'·

ASSAYS ANALYSIS METALLURGICAL PROBLEMS

HAVEN & SON

ASSAYERS···CHEMISTS

P. O. Box 377 FORT COLLINS. COLO.

Oldest Laboratory in Northern Colorado. Established 1903

MANAGEMENT

FINANCING METHODS REPORTS

EXAMIN ATIONS

Jan.:ll5" 1938 Mr. Georg~ J. Bancroft Mining Engineer

214 Broadway Denver, Colo.

Dear Sir:-

I obtained the following results on two samples submitted to me by Mr. Terry.

# 4611 "(Jreenstone"

Reacts for Cm'omimn, Platinum, and sm~ll amount of Gold and Silver.

# 4612 "Blackstone"

).02 Troy Oz a, M'lt!lllicPlatinum 1.27 "" "Palladium

Tantalum oxide (Ta20S)

Note-The above is not strictly F~re Ta20S contaminated with Columbium.

as is is somewhat The crystals obtained from the evaporation of Platinum in solution as a chloride (Hydrochlorplatinic acid) converts the compound to Platinous Chloride. when carefully heated. Great care is necessary not to convert some to metallic Platinum.

I used the following scheme on the samples.

Treated the finely pul'rorized pulp with ...H Cl to dryness. Take up with H Cl and H20. Filter and wash with hot water. Treat residue 1n filter with hot ammonia which clears up any Argentic chloride

which may be present, wash dry and treat residue with Hydrofluoric acid and Sulphuric acid. Run dry and treat residue with Aqua regia. to dryness Take up with H Cl, dilute with hot water, filter, wash and pass

H;>S through the warm filtrate. Treat this precipitate as in ordinary PfatimUlllassay precipitating with Ammonium Chloride.

More work is indicated on these ores. lI.yfacilities are not what they should be to carryon an investigation such as this is.

I hope there can soon be a laboratory established to handle the rare metals.

Very Truly

~~-Q

C.&. Haven ~

COLORADO SCHOOL OF MINES

EXPERIMENTAL ORE DRESSING AND METALLURGICAL PLANT

A. J. WEINIG, DIRECTOR: H. F. LUNT, E. STARITZKY, ASSOCIATE DIRECTORS

GOLDEN, COLORADO,---~ll-1~-,--.l11313-'--

_Jg,. Q!l_Q_~g,Q--J>-a!l!);r-Q.t.:t ... --- __

__gJ'iL~_:r_Q.adlf_'l,;,r.. . _

_J2l!!!y~;r_, QQl_Q.L ----

Dear Sir:

The sample. which you sent us haa been examined and tested with the following results:

Your ltb.rk

See Reference

Befow

PegnBtite with a little Magnetite. • • • • • • • • • • • •• A We find no other metallic laineral than the magnetite.

REFERENCES: A-SamlJle has no commercial value; that is there is no open market for it, or it is too low grade to pa,y for production and! marketing•

Be-Sample might have eommerelal value if in very large quantity under extremely favorable conditions.

C-Sample might have commercial value if in sufficient quantit)' to justify a local treatment plant.

D-Sample has commercial value in crude state under ordinary mining conditions.

NOTE: W'hether or not a mineral deposit has commercial value is an involved; eeonomle problem. The principal fadors which must be considered are: grade or ore, character of ore as it affects cost and method of treatment, size and character of deposit, location of deposit with respect to markets for the ore or its products, and local conditions affecting eose of mining and treatment. In the case of non-metallic minerals and rarer metals marketing is usually more important than mining.

Whether there is a demand for the product, or whether a demand can be created, at a price which will insure profitable operation must be investigated. Sometimes local conditions give a mineraI deposit, sueh, for instance, as a gravel bank, considerable c0m-

mereial value where or(l~narily and intrinsically the material is worthless.

Yours very truly,

NOTE: If this rClmrt does not tell what you "nult to know aboillt tile saniplelll, or is not plain, l)lease do not llesitate to write fol" further lu'formation.

COLORADO SCHOOL OF MINES EXPERIMENTA;-..t.~NT

By---aifu.u:t---

�---~----_ ...,...- ~

A5SA¥ERS

CHEMISTS

WILFLI:Y

BRIBACH

PROBLEMS

DENVER, COLORADO

CERTIFICATE OF ASSAYS

FOR

/t4t .~. ~~---ft .

OUNCES PER TON PER CENT

DESCRIPTION OR NO.

GOLD SILVER COPPER LEAD ZINC

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Wilf~ & Briba~h

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ANALYSIS RESEARCH

TELEPHONE:

SPRUOE 6534

w.

CONSULTING CHEMIST

251 BROADWAY

DENVER, COLO.

February 2, 1939.

Mr. George J. Bancroft, 214 Broadwa.y,

Denver, Colorado.

Dear Sir:-

I attach the method of a.nalysis which I have been using on your ore.

By this method I found 0.63% mixed oxides on the 4:1 concentrate and 1.2% in the 16:1 concentrate.

This method gp.ve 72.5% mixed oxides on the known sample of Columbi te which you submitted.

Qualitative analysis according to Noyes and Bray showed only a small amount of columbium and tantalum present.

Fusing the 4:1 concentrate with sodium carbonate, dissolVing in HC1.

dehydrating the silica and volatilizing the silica. gave 45.35% Silica. and left a non- volatile residue from driVing off the silica with HF of only ~.39%. This non-volatile residue would comtain the columbium(and tantaluoljor a considerable portion of it.

Fusing the 4:1 concentrate with sodium pyrosulfate to complete decomposition, treating melt with dilute sulfuric acid, filtering off the insoluble material and

treating it with ammonium p~lysulfide left a residue of 0.8% on the ore. This residue would not contain all the columbium and tantalum and would be contaminated with tungsten, titanium, etc.

So it does not appear that the samples submitted to me contain over possibly 1% columbi'Ull1and tantalum oxides.

The sample of tailings contained '0.27% V205 and no arsenic, molybden'Ull1or chrOllliUlD.

Very truly youts,

~/~

ANALYSIS RESEARCH

TELEf"HONE Sf"RUCE55:34

W. L. CONRAD

CONSULTING CHEMIST

251 BROADWAY

DENVER, COLO.

Ore Analysis for ~ and Cb.

1. Treat 2-3 grams 200 mesh ore in platinum crucible with 10-15 cc HF. ~ moistening first with water to prevent spattering from the action of the

concentrated HF. Heat with crucible covered and in an air bath in a larger crucible below the boiling point and do not let it go to dryness. Repeat about 5 times and when decomposition is complete, dilute so the solution contains 5-10 cc HFper 100 cc.

2. Filter using hard rubber utensils and wa,shwell with dilute HF (1:20).

3. Evaporate the HFfiltrate containing the earth acids with a little sulfUric acid in platinum to fumes of sulfuric acid. Repeat the evaporation with more acid to be sure all the fluorine is driven off. The amount of sulfuric acid to bIl.ve present must be sufficient so tbll.t there is no insoluble material when the acid is cool (7-10 cc sulfuric acid).

4. Pour the cool sulfuric acid solution into 25-35 cc of 20%tartaric acid solution and rinse out the crucible. If there is insoluble lnateria.1 it must be filtered off, the pa;per burned, the residue dissolved in HFand evaporated with sulfuric acid to remove the fluorine and this sulfuric acid solution added to tile previous one in the 20%tartaric acid.

5. Dilute so that the solution contains approximately 1%sulfuric acid and 5%tartartllc.

6. Treat With hydrogen sulfide and filter off any precipitate, Wlij,shingit with a solution containing 1%sulfuric and

5%

7. To the filtrate add ammonia.to alkaline reaction when there will usually be a heavy dark precipita.te. Avoid great excess of ammonia.as it seems to form polysulfides , which precipitate sulfur on 1a.ter acidification a.ndalso seems to keep some of the iron group in solution.

ANALYSIS RESEARCH

TELEPHONE SPRUCE 61534

W. L. CONRAD

CONSULTING CHEMIST

251 BROADWAY

DENVER, COLO.

Ore Analysis for Ta. and Cb, -2-

8. Treat witb H2Sat least one half hour and digest on ~ot plate just below boiling one half hour and then again trea.t with H2Sfor a few minutes. Solution must be kept alkaline to litmus with ammoniathru this step.

9. Filter and ~sh with a solution of alkaline 5% amnoniumtartrate saturated with H2S.

10. Boil filtrate till hydrogen sulfide is removed.

11. Acidify with 6N (17%) sulfuric acid and add 50 cc excess and cool solution.

12. Trea.t acid solution with a 6% solution of cupferron in ~ter with stirring and add excess (about 50 cc altogether). Addpaper pulp and stir for a. few minutes.

13. Filter using light suction and a platinum cone and ~sh with dilute sulfuric acid containing a little cupferron.

14. Ignite precipita.te and paper in porcelain crucible and weigh the mixed oxides.

TELEPHONE: MELROSE 1148

JOHNSON f1ATTHEY

&

PRECIOUS METAL PRODUCTS

JMo

JOHNSON MATTHEY'& CO.,LTO.

HATTON GAROI;:N LO NOON ,E.G,I, ENGLAND

BRANCH OFFICE:

1050 BEAVER HALL HILL MONTREAL

19B CLINTON STREET

TORONTO

YOUR REFERENCE May 9th, 1939.

Mr. George J. Bancroft, Bancroft Block,

214 Broadway, Denver, Colo.

Dear Sir,

As promised in our letter to you of April 19th, we wrote to our Parent Company in Great Britain before receiving your letter of April 22nd.

We have received their reply, which confirms what we have already stated to you.

They point out that the problem of buying osmium

bearing materials is very different to that of buying ores or concentrates, containing the metals mentioned in your letter of April 14th.

They state they would be very pleased to see further production of osmium, but it is impossible to indicate the possible percentage recovery, or the cost of treatment, without careful examination and analysis of a sample of at least 5 Ibs.

Yours very truly,

for JOHNSON MATTHEY & CO. (CANADA) LIMITED,

?r::~

E. C. Fairbrother.

ECF:AEM.

CONTINENTAL ORE CORPORATION 500 FIFTH AVENUE

NEW YORK

CABLE ADDRESS:

LATINORE July 6, 1939.

TELEPHONE:

LACKAWANNA 4.2221 CODES;

A. B. C. 6TH EDITION ACME & SUPPLT.

Mr. W. L. Conrad, 251· Broadway, Denver/Colorado.

Dear Sir,

Please let us have your tarif for examinations of ore.

We take this opportunity of informing you that we are especially interested in Fluorspar and Vanadium at the present (as far as Colorado is concerned), and should you be in a position to bring us in contact with some new supplier we shall appreciate it very much.

Thanking you in advance for the attention you will give this matter, we remain,

Yours very truly,

CONTINENTAL ORE CORPORATION.

HJL/LL.

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ASSAYE~S

ORE DRESSING PROBLEMS

OSCAR N. BRIBACH

SUCCESSOR TO WILFLEY 8:BRIBACH

1948 BROADWAY DENVER. COLORADO

CERTIFICATE OF ASSAYS

PHONE TABOR 5403

FOR

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C HA RG ES $ __ c1""----"=- _ _BY ^{OSCAR N. BRIBACH}

Geo. J. Bancroft & Company

MEMBER COl-ORA COSCIENTIFIC SOCIETY f'RACTICAI.. WORKING TESTS OF ORES BY

CYANIDE PROCESS MEMBER AME;RICAN INSTITUTE MINING ENGINEERS

CABLE ADDRESS: ·'BANCROFT." DENVER

AMALGAMATION

WM. FAULKNER. METALLURGIST

ASSAY OFFICE AND ORE TESTING WORKS

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DENVER. COLO .• _

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No. _

Charges, $, _

Feb. 21, 194:t.

Mr. Geo. J. Banoroft 214 Broadway

Denger, Colo.

Dear Mr. Banoroft:

I reoeived the sample of Blaokstone oonoentrates for analysis of the tantalum and platinum group metals, and the results of my anal¥sis, after oonsiderable work, are as follows:

The tantalum group: After oareful deoomposition with

suitable reagents, all but a few milligrams of material went into solution. This slight residue appears to be the whole diffioulty and is, I believe, responsible for the positive reports of several previous analysts regarding the tantalum-oolumbium group.

On speotrographio analysis, this residue is shown to be a diffioult- ly soluble compound of titanium, phosphorus and iron whioh would manifest itself, in the usual ohemioal soheme, as tantalum and

oolumbium. This aooounts for your previous positive reports for the above mentioned metals.

The platinum group: There seemed to be ho doubt about the absenoe of all the platinum metals exoept osmium, ruthenium and iridium, so my efforts were oonoentrated on these three elements.

The osmium-:i!utheniumdistillation was oarried out on two partially oupelled lead buttons, whioh is reoommended by the University of Toronto. This method, acoording to their figures, will yield

So%-9lf;b of the total osmium present. After a very careful and pro- longed distillation the osmium was precipitated by hydrogen sulfide and allowed to stand over night. A slight black precipitate whioh oorresponded to four ounoes per ton of osmium was detected. On

speotrographio analysis it was shown to oonsist of silver, lead and iron. These impurities were present in the sodium hydroxide used for the absorption, and on calculation proved to be entirely responsible for the slight precipitate observed.

I also made two very oareful analysis for vanadium. The sample taken near the shaft showed 6.21% vanadium oxide, and the sample taken on up the hill showd none.

I have done more work than is here indicated, but this is just a briel outline to show the more pertinent points,

and is intended to show wbp:y:ou were receiving suoh erratic reports.

In oonolusion, my results indioate no tantalum or platinum group metals.

Simoerely,

1hH,m~

--- ^---

QUALITLTIVB SPECTnOGRAPHIC ANALYSIS

For: Geo. J. Bancroft March 12, 1941

The followimg elements are present in this sample. A group separation was made for the rare earths.

° denotes prominent elements

°Silicon

T~

Titanium

°Calcium Manganese

°Aluminium Barium

°Iron Phosphorus

°Magnesium

°Potassium

Chromium Silver

°Sodium ~aolybdenum

Vanadium

No rare earths o~platinum metals were detected.

1Im<17tdL

5pe& trograpl'l.er

MINE SAMPLING

EXAMINATIONS

OFFICE AND LABORATORY

ASSAYERS AND CHEMISTS

2301·2305 15TH STREET

PHONE GLENDALE 2768

ALFRED TELLAM ORE TESTING

MILL DESIGN

MILL CONSTRUCTION

MILL PRACTICE

METALLURGISTS

MANAGEMENT

TELLAM'S MINES SERVICE

DENVER, COLORADO METALLURGISTS

REPORT OF MhTALLURGICAL ANALYSIS

ORDER NO ~4",6",O,,3 _

SHEET NO,, _

DATE Sept.I8th 194L Mr.George Bancroft,

214 Broadway, Denver,

Colorado.

Dear Sir:-

This is to certify that your sample left at our Laboratory for Vanadi~ Analysis Sept.I7th 1941 gava the following results:-

Vensdi~:- None (No indications)

The Sample was fused with Patassi~B.- Sulphate, but no showing of

V2 05.

The sample was taken up with _H N _{03 +H} C L i"H2 004 and _rumed but no V₂ 05 showed.

The Sample was fused With Na2 003 and taken up with H2 S 04 no indications of V2 05'

Thank you. --We aprreciate your patronage and stand ready to serve at all times.

Respectfully.

CV;~

Mines Service.