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Hurdtown Apatite Mine, Hurdtown, Jefferson Township, Morris Co., New Jersey, USAi
Regional Level Types
Hurdtown Apatite MineMine
Hurdtown- not defined -
Jefferson TownshipTownship
Morris Co.County
New JerseyState
USACountry

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Latitude & Longitude (WGS84): 40° 58' 0'' North , 74° 34' 59'' West
Latitude & Longitude (decimal): 40.96667,-74.58333
GeoHash:G#: dr6cncf04
Locality type:Mine
Köppen climate type:Cfa : Humid subtropical climate


An iron-phosphate mine located near Hurdtown, about 5 miles North of Dover. Started and closed before 1855. Ore was a pyritiferous magnetite.

Although apatite is very common in the iron ores of northern New Jersey, this is one of the very few ore deposits where it becomes a major component. Unfortunately, this prospect is so old, pre-1855, and so sketchily described that a precise understanding of the nature of the ore may be impossible. Bayley(1910) says that apatite "occurs in irregular seams, often intermixed with pyrrhotite...". This suggests secondary hydrothermal reworking, possibly during the long period of pegmatite intrusion and hydrothermal activity that followed the Ottawan orogeny. Unfortunately, this is anything but clear. Elsewhere, Bayley notes that the apatite is "usually in aggregates mixed with all the other minerals mentioned". This sounds more like the dispersed occurrence common throughout the region.

It seems that the ore was to low grade and sulphidic to be mined for iron and to low grade to be mined for phosphate.

Regions containing this locality

North America Plate

Plate - 4,950 mineral species & varietal names listed

Select Mineral List Type

Standard Detailed Strunz Dana Chemical Elements

Mineral List


6 valid minerals.

Detailed Mineral List:

'Apatite'
Description: Famous for large apatite crystals now extremely rare to find.
Reference: The Iron Mines of NJ (1910), Bayley:332; NJ State Geol. Ann. Rpt. (1856):167; State NJ Bull. #50:192.
Calcite
Formula: CaCO3
Reference: The Iron Mines of NJ (1910), Bayley:332; NJ State Geol. Ann. Rpt. (1856):166; State NJ Bull. #50:192.
'Feldspar Group'
Reference: NJ State Geol. Ann. Rpt. (1856):167.
Ferro-hornblende
Formula: ☐{Ca2}{Fe2+4Al}(AlSi7O22)(OH)2
Reference: NJ State Geol. Ann. Rpt. (1856):167.
'Limonite'
Formula: (Fe,O,OH,H2O)
Reference: NJ State Geol. Ann. Rpt. (1856):167.
Magnetite
Formula: Fe2+Fe3+2O4
Reference: The Iron Mines of NJ (1910), Bayley:332; NJ State Geol. Ann. Rpt. (1856):166; State NJ Bull. #50:192.
'Mica Group'
Reference: NJ State Geol. Ann. Rpt. (1856):167.
Pyrite
Formula: FeS2
Reference: The Iron Mines of NJ (1910), Bayley:332; NJ State Geol. Ann. Rpt. (1856):167; State NJ Bull. #50:192.
Pyrrhotite
Formula: Fe7S8
Reference: The Iron Mines of NJ (1910), Bayley:332; NJ State Geol. Ann. Rpt. (1856):166; State NJ Bull. #50:192.
Quartz
Formula: SiO2
Reference: NJ State Geol. Ann. Rpt. (1856):167.

List of minerals arranged by Strunz 10th Edition classification

Group 2 - Sulphides and Sulfosalts
'Pyrite'2.EB.05aFeS2
'Pyrrhotite'2.CC.10Fe7S8
Group 4 - Oxides and Hydroxides
'Magnetite'4.BB.05Fe2+Fe3+2O4
'Quartz'4.DA.05SiO2
Group 5 - Nitrates and Carbonates
'Calcite'5.AB.05CaCO3
Group 9 - Silicates
'Ferro-hornblende'9.DE.10☐{Ca2}{Fe2+4Al}(AlSi7O22)(OH)2
Unclassified Minerals, Rocks, etc.
'Apatite'-
'Feldspar Group'-
'Limonite'-(Fe,O,OH,H2O)
'Mica Group'-

List of minerals arranged by Dana 8th Edition classification

Group 2 - SULFIDES
AmXp, with m:p = 1:1
Pyrrhotite2.8.10.1Fe7S8
AmBnXp, with (m+n):p = 1:2
Pyrite2.12.1.1FeS2
Group 7 - MULTIPLE OXIDES
AB2X4
Magnetite7.2.2.3Fe2+Fe3+2O4
Group 14 - ANHYDROUS NORMAL CARBONATES
A(XO3)
Calcite14.1.1.1CaCO3
Group 75 - TECTOSILICATES Si Tetrahedral Frameworks
Si Tetrahedral Frameworks - SiO2 with [4] coordinated Si
Quartz75.1.3.1SiO2
Unclassified Minerals, Rocks, etc.
'Apatite'-
'Feldspar Group'-
Ferro-hornblende-☐{Ca2}{Fe2+4Al}(AlSi7O22)(OH)2
'Limonite'-(Fe,O,OH,H2O)
'Mica Group'-

List of minerals for each chemical element

HHydrogen
H Ferro-hornblende☐{Ca2}{Fe42+Al}(AlSi7O22)(OH)2
H Limonite(Fe,O,OH,H2O)
CCarbon
C CalciteCaCO3
OOxygen
O CalciteCaCO3
O Ferro-hornblende☐{Ca2}{Fe42+Al}(AlSi7O22)(OH)2
O Limonite(Fe,O,OH,H2O)
O MagnetiteFe2+Fe23+O4
O QuartzSiO2
AlAluminium
Al Ferro-hornblende☐{Ca2}{Fe42+Al}(AlSi7O22)(OH)2
SiSilicon
Si Ferro-hornblende☐{Ca2}{Fe42+Al}(AlSi7O22)(OH)2
Si QuartzSiO2
SSulfur
S PyriteFeS2
S PyrrhotiteFe7S8
CaCalcium
Ca CalciteCaCO3
Ca Ferro-hornblende☐{Ca2}{Fe42+Al}(AlSi7O22)(OH)2
FeIron
Fe Ferro-hornblende☐{Ca2}{Fe42+Al}(AlSi7O22)(OH)2
Fe Limonite(Fe,O,OH,H2O)
Fe MagnetiteFe2+Fe23+O4
Fe PyriteFeS2
Fe PyrrhotiteFe7S8

Regional Geology

This geological map and associated information on rock units at or nearby to the coordinates given for this locality is based on relatively small scale geological maps provided by various national Geological Surveys. This does not necessarily represent the complete geology at this locality but it gives a background for the region in which it is found.

Click on geological units on the map for more information. Click here to view full-screen map on Macrostrat.org

Stenian
1000 - 1200 Ma



ID: 2915938
Hornblende Granite

Age: Stenian (1000 - 1200 Ma)

Stratigraphic Name: Byram Intrusive Suite

Description: Pinkish-gray- to medium-buff-weathering, pinkish-white or light-pinkish-gray, medium- to coarse-grained, gneissoid to indistinctly foliated granite and sparse granite gneiss composed principally of microcline microperthite, quartz, oligoclase, and hornblende. Some phases are quartz syenite or quartz monzonite. Includes small bodies of pegmatite and amphibolite not shown on map. U-Pb age approximately 1,090 Ma (Drake and others, 1991b).

Comments: Byram Intrusive Suite (Middle Proterozoic) (Drake, 1984) Original map source: Dalton, R.F., Herman, G.C., Monteverde, D.H., Pristas, R.S., Sugarman, P.J., and Volkert, R.A., 1999, New Jersey Department of Environmental Protection, Bedrock Geology and Topographic Base Maps of New Jersey: New Jersey Geological Survey CD Series CD 00

Lithology: Major:{granite}, Minor:{gneiss,quartz syenite,quartz monzonite}, Incidental:{pegmatite, amphibolite}

Reference: Horton, J.D., C.A. San Juan, and D.B. Stoeser. The State Geologic Map Compilation (SGMC) geodatabase of the conterminous United States. doi: 10.3133/ds1052. U.S. Geological Survey Data Series 1052. [133]

Mesoproterozoic
1000 - 1600 Ma



ID: 3188605
Mesoproterozoic crystalline metamorphic rocks

Age: Mesoproterozoic (1000 - 1600 Ma)

Lithology: Paragneiss; paragneiss

Reference: Chorlton, L.B. Generalized geology of the world: bedrock domains and major faults in GIS format: a small-scale world geology map with an extended geological attribute database. doi: 10.4095/223767. Geological Survey of Canada, Open File 5529. [154]

Data and map coding provided by Macrostrat.org, used under Creative Commons Attribution 4.0 License

References

Sort by

Year (asc) Year (desc) Author (A-Z) Author (Z-A)
New Jersey State Geologist Annual Reports: (1855): 166-168; (1868): 603-606; (1879): 71.
Bayley (1910) The Iron Mines of New Jersey: 332-333.


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