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Riley Sand Chrome Property

Prospect in Cecil county in Maryland, United States with commodities Chromium, Feldspar, Talc-Soapstone
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Sections on this page
  1. Identification information
  2. Geographic coordinates
  3. Site location context
  4. Geographic areas
  5. Commodities
  6. Materials information
  7. Nearby scientific data
  8. Ore body information
  9. Economic information about the deposit and operations
  10. Mining district
  11. Mineral rights holdings
  12. Land status
  13. Ownership information
  14. Reserves and resources
  15. Workings at the site
  16. Links to other databases
  17. Bibliographic references
  18. Reporter information

Geologic information

Identification information

Deposit ID 10169882
MAS/MILS ID 0240150014
Record type Site
Current site name Riley Sand Chrome Property
Alternate or previous names Riley Quarry

Geographic coordinates

Point of reference Ore Body
Geographic coordinates: -76.15294, 39.71782 (WGS84)
Elevation 140
Location accuracy 100(meters)

Site location context

Political divisions (FIPS codes)

Cecil(county)

Maryland(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Conowingo Dam(quadrangle 1:24,000 scale)

York(quadrangle 1:100,000 scale)

Baltimore(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Lower Susquehanna(hydrologic unit)

Lower Susquehanna(hydrologic accounting unit)

Susquehanna(hydrologic subregion)

Mid Atlantic(hydrologic region)

Geographic areas

Country State County
United States Maryland Cecil

Commodities

Commodity Importance
Chromium Critical Primary
Feldspar Tertiary
Talc-Soapstone Tertiary

Materials information

Materials Type of material
Chromite Unknown

Nearby scientific data

Ore Body (1) -76.15294, 39.71782
ListMap

Economic information

Ore body information

  • Thickness 0.7M
    Length 305M
    Width 152M
    Area 5.2HA
    Depth to top 0M
    Field Value
    Type of Orebody #1 PLACER
    Shape of Orebody #1 LENTICULAR
    Primary mode of Origin RESIDUAL CONCENT
    Secondary mode of Origin SEDIMENTATION
    Primary Ore Control LITHOLOGY
    Secondary Ore Control OTHER
    Minimum Depth to Top 0
    Avg. Thick. Unconsol. Mat. .7
    Min. Thick. Unconsol. Mat. 0
    Total Surface Area (HA) 5.2
    Date of Last Modification 820616

Comments on the geologic information

  • CHROMITE OCCURS MAINLY AS PLACER-RESIDUAL DEPOSIT WEATHERING OF SERPENTINE AND SUBSEQUENT TRANS. BY STREAM ACTION, DEPOSIT HAS ACCUMULATED AS SAND & GRAVEL PLACERS.
  • CR/FE RATIO, EST AT 2.77 TO 1.0

Economic information about the deposit and operations

Operation type Surface
Development status Prospect
Commodity type Both
Significant Yes
Mining method Alluvial Mining
Milling method Gravity

Mining district

District name State Line District

Mineral rights holdings

Type of mineral rights Unknown

Land status

Ownership category Private

Ownership information

  • Type Owner
    Owner Henry M Riley
    Interest 100
    Home office Maryland
    Year 1943
    First year 1943
    Last year 1979
  • Type Owner
    Owner Kerr
    Interest 100
    Home office Maryland
    Year 1979
    First year 1979

Reserves and resources

  • Type In-situ
    Estimate year 1943
    Indicated 68000mt ore
    Demonstrated 68000mt ore
    Total resources 68000mt ore
    Commodity Subtype Grade units Group Importance Year
    Chromium Cr2O3 0.75 wt-pct Chromium Major 1943

Comments on the reserve resource information

  • R1 = M1C1 RESERVE COLUMN 1=MATRIX 1 COLUMN 1 RESERVES REPORTED AT 75% LEVEL BY REQUEST PUBLISHED RESERVES REFLECT WASHED GRADE OF DEPOSIT, QUANTITY RESERVES REFLECT IN SITU GRADE 0.75 X WASHING RATIO(0.65) = 0.49 M9C4 = M1C1 MATRIX 9 COL. 4 EQUALS MATRIX 1 COL.1
  • TONNAGES ARE IN-SITU ORE (REC=100%), GRADE IS CR2O3

Workings at the site

  • Type of workings Surface
    Area 4.6HA
    Field Value
    MAS Development Schedule # 1
    Mining Record # 1
    Status of Mining Method PROPOSED
    Mining Method OPEN PIT
    Swell Factor .88
    Percent Waste Rock 0
    Avg. Overburden Thickness 0
    Hardness of Ore SAND, SILT
    Capacity 200
    Capacity Units MT ORE/DAY
    Preprod. Stripping Vol. 0
    Unit Production Cost 2.67
    Units of Production $/MT ORE
    Operating Days per Year 250
    Operating Shifts per Day 1
    Year of Information 1979

Comments on other economic factors

  • CR:FE IS ESTIMATED AT 2.77:1

Reference information

Bibliographic references

  • Reserve-Resource

    JERMAIN,G. WAR MINERALS RPT. RILEY SAND CHROME PROPERTY,

  • Reserve-Resource

    NO. 755, BUMINES, 13PP, 1943

  • Deposit

    HUNTER,W.L.&G.V. SULLIVAN. UTILIZATION STUDIES ON CHROMITE

  • Deposit

    FROM SEIAD CREEK,CA. BUMINES RI5576,1960, P.22-23.

  • Deposit

    PEARRE,N & A. HEYL. CHROMITE AND OTHER MINERAL DEPOSITS IN

  • Deposit

    SERPENTINE ROCKS OF THE PIEDMONT UPLAND OF MD,PA,&DEL.

  • Deposit

    US. GEOLOGICAL SURVEY BULL. 1082K, 1960, P707.

Reporter information

Type Date Name Affiliation Comment
Reporter 21-FEB-1995 Dw,Mf,Cp U.S. Bureau of Mines

Beyond USGS

Supplemental information added by qvyshift.com. Not part of the original USGS MRDS record.

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