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Eaglebrook Mine (Nant-Y-Cagel Mine; Nantycagl Mine; Nantygagal Mine; Dolrhyddlan Mine), Nant-y-Moch Reservoir area, Talybont, Ceulanymaesmawr, Ceredigion (Dyfed; Cardiganshire), Wales, UK

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Eaglebrook mine has been known for many years as a site that has produced many fine micros, of mostly basic sulphates of lead, copper, and zinc.
Please bear in mind that the site is SSSI (a site once brought to prominence by amateur collectors is now off limits to those that helped the professional institutions).

The mine is quite old, worked by the Company of Mine Adventures sometime around 1700, and continued to be developed until 1722. In 1853 the mine was reopened, but it seems to have been more to sell shares, than to work the mine. However, work did continue until 1865.

There were other short trials until final closure in 1874-5. The mine was developed to a depth of 50 fathoms at the east shaft.

Output is only recorded for the years after 1853, with most ore produced between 1856-59. Recorded output is 598 tons of lead ore and 71 tons of copper ore.





 UK OS Grid Reference: SN736892
Map Reference: 52°29'8"N , 3°51'42"W

This locality information is for reference purposes only. You should never attempt to visit any sites listed in mindat.org without first ensuring that you have the permission of the land and/or mineral rights holders for access and that you are aware of all safety precautions necessary.



Mineral List:
  		•  Anglesite
    PbSO
     
    4
    Habit: Prismatic, blocky, bladed.
    Colour: Colourless, white, tinted brown.
    Description: Colourless xls to 1mm, associated with linarite, brochantite, cerussite, caledonite, sussannite.
    Reference: [BMS Database]
    Site Photo
    Eaglebrook Mine (Nant-Y-Cagel Mine; Nantycagl Mine; Nantygagal Mine; Dolrhyddlan Mine), Nant-y-Moch Reservoir area, Talybont, Ceulanymaesmawr, Ceredigion (Dyfed; Cardiganshire), Wales, UK
    © Steve Rust
  		•  Ankerite
    Ca(Fe
    2+
     
    		 ,Mg,Mn
    2+
     
    		)(CO
     
    3
    		)
     
    2
    Habit: Rhombic crystals, massive
    Colour: Creamy, brown
    Description: Found as large blocks on the dumps. Cavites to several cms are lined with rhombic crystals to 8mm.
    Reference: [BMS Database]
  		•  Aurichalcite ?
    (Zn,Cu)
     
    5
    		[(OH)
     
    3
    		|CO
     
    3
    		]
     
    2
    Reference: [BMS Database]
  		•  Baryte
    BaSO
     
    4
    Reference: [J Lamond Micro Collection (acquired from H Critchley)]
  		•  Bechererite
    (Zn,Cu)
     
    6
    		Zn
     
    2
    		[(OH)
     
    12
    		|(SO
     
    4
    		,HSiO
     
    4
    		)
     
    2
    		]
    Habit: Stuby inverted cones
    Colour: Colourless to very pale blue
    Description: Very pale blue cone-like xls to 0.3mm (XRD)
    Reference: [UKJMM.23.2003]
    Site Photo
    Eaglebrook Mine (Nant-Y-Cagel Mine; Nantycagl Mine; Nantygagal Mine; Dolrhyddlan Mine), Nant-y-Moch Reservoir area, Talybont, Ceulanymaesmawr, Ceredigion (Dyfed; Cardiganshire), Wales, UK
    © Steve Rust
  		•  Bindheimite
    Pb
     
    2
    		Sb
     
    2
    		O
     
    6
    		(O,OH)
    Habit: Crusts
    Colour: Yellow
    Reference: [BMS Database]
  		•  Brochantite
    Cu
     
    4
    		[(OH)
     
    6
    		|SO
     
    4
    		]
    Habit: Platy
    Colour: Emerald green
    Description: Drusy crusts and single xls to 1mm (nice micros). Associated with most species.
    Reference: [BMS Database]
    Site Photo
    Eaglebrook Mine (Nant-Y-Cagel Mine; Nantycagl Mine; Nantygagal Mine; Dolrhyddlan Mine), Nant-y-Moch Reservoir area, Talybont, Ceulanymaesmawr, Ceredigion (Dyfed; Cardiganshire), Wales, UK
    © Steve Rust
  		•  Calcite
    CaCO
     
    3
    Habit: Massive
    Colour: White
    Reference: [BMS Database]
  		•  Caledonite
    Cu
     
    2
    		Pb
     
    5
    		[(OH)
     
    6
    		|CO
     
    3
    		|(SO
     
    4
    		)
     
    3
    		]
    Habit: Prismatic
    Colour: Light blue
    Description: Light blue prismatic xls to 0.5mm, associated with anglesite, and cerussite
    Reference: [S Rust Collection]
    Site Photo
    Eaglebrook Mine (Nant-Y-Cagel Mine; Nantycagl Mine; Nantygagal Mine; Dolrhyddlan Mine), Nant-y-Moch Reservoir area, Talybont, Ceulanymaesmawr, Ceredigion (Dyfed; Cardiganshire), Wales, UK
    © Steve Rust
  		•  Cerussite
    PbCO
     
    3
    Habit: Various. mostly prismatic
    Colour: Colourless-white
    Description: Xls to 1cm
    Reference: [BMS Database]
    Site Photo
    Eaglebrook Mine (Nant-Y-Cagel Mine; Nantycagl Mine; Nantygagal Mine; Dolrhyddlan Mine), Nant-y-Moch Reservoir area, Talybont, Ceulanymaesmawr, Ceredigion (Dyfed; Cardiganshire), Wales, UK
    © Steve Rust
  		•  Cesàrolite
    PbH
     
    2
    		Mn
     
    3
    		O
     
    8
    Reference: [Cotterell, T.F., 2006. The first British occurrence of cesarolite at Eaglebrook Mine, Ceulanymaesmawr, Ceredigion, Wales. UK Journal of Mines and Minerals, 27, 36-38.]
  		•  Chalcocite
    Cu
     
    2
    		S
    Habit: Massive
    Reference: [BMS Database]
  		•  Chalcophanite
    (Zn,Fe,Mn)Mn
     
    3
    		O
     
    7
    		·3H
     
    2
    		O
    Reference: []
    Site Photo
    Eaglebrook Mine (Nant-Y-Cagel Mine; Nantycagl Mine; Nantygagal Mine; Dolrhyddlan Mine), Nant-y-Moch Reservoir area, Talybont, Ceulanymaesmawr, Ceredigion (Dyfed; Cardiganshire), Wales, UK
    © Steve Rust
  		•  Chalcopyrite
    CuFeS
     
    2
    Habit: Massive
    Reference: [BMS Database]
  		•  Chrysocolla
    (Cu,Al)
     
    2
    		H
     
    2
    		Si
     
    2
    		O
     
    5
    		(OH)
     
    4
    		·nH
     
    2
    		O
    Habit: Thin crusts
    Colour: Pale blue-blue green
    Reference: [BMS Database]
  		•  Connellite
    Cu
     
    19
    		[(OH)
     
    32
    		|SO
     
    4
    		|Cl
     
    4
    		] · 3H
     
    2
    		O
    Habit: Balls
    Colour: Dark blue
    Description: Balls to 0.5mm
    Reference: [No reference listed]
  		•  Copper
    Cu
    Habit: Hackly masses
    Reference: [BMS Database]
  		•  Covellite
    CuS
    Habit: Platy
    Reference: [BMS Database]
  		•  Cuprite
    Cu
     
    2
    		O
    Habit: Cubic and octahedrons, veinlets
    Description: Xls to 0.5mm
    Reference: [BMS Database]
  		•  Devilline
    CaCu
     
    4
    		(SO
     
    4
    		)
     
    2
    		(OH)
     
    6
    		·3H
     
    2
    		O
    Habit: Lath like
    Reference: [BMS Database]
  		•  Dolomite
    CaMg(CO
     
    3
    		)
     
    2
    Reference: [BMS Database]
  		•  Dundasite
    PbAl
     
    2
    		[(OH)
     
    2
    		|CO
     
    3
    		]
     
    2
    		 · H
     
    2
    		O
    Reference: [BMS Database]
  		•  Galena
    PbS
    Habit: Massive
    Reference: [BMS Database]
  		•  Goethite
    α-Fe
    3+
     
    		O(OH)
    Habit: Thin crusts
    Reference: [BMS Database]
  		•  Gold
    Au
    Reference: [BMS Database]
  		•  Hemimorphite
    Zn
     
    4
    		[(OH)
     
    2
    		|Si
     
    2
    		O
     
    7
    		] · H
     
    2
    		O
    Habit: Bladed, drusy
    Colour: Colourless-yellowish
    Description: Colourless to yellowish drusy crusts & vughy masses to a few cms.
    Reference: [BMS Database]
    Site Photo
    Eaglebrook Mine (Nant-Y-Cagel Mine; Nantycagl Mine; Nantygagal Mine; Dolrhyddlan Mine), Nant-y-Moch Reservoir area, Talybont, Ceulanymaesmawr, Ceredigion (Dyfed; Cardiganshire), Wales, UK
    © Steve Rust
  		•  Hydrozincite
    Zn
     
    5
    		[(OH)
     
    3
    		|CO
     
    3
    		]
     
    2
    Habit: Thin crusts
    Colour: white
    Fluorescence: Weak blue-white
    Reference: [BMS Database]
  		•  Langite
    Cu
     
    4
    		[(OH)
     
    6
    		|SO
     
    4
    		] · 2H
     
    2
    		O
    Habit: Pseudohexagonal
    Colour: Deep blue green
    Description: Crusts of small xls to 0.7mm (nice micros), associated with many of the supergene species.
    Reference: [BMS Database]
    Site Photo
    Eaglebrook Mine (Nant-Y-Cagel Mine; Nantycagl Mine; Nantygagal Mine; Dolrhyddlan Mine), Nant-y-Moch Reservoir area, Talybont, Ceulanymaesmawr, Ceredigion (Dyfed; Cardiganshire), Wales, UK
    © Steve Rust
  		•  Laurionite
    PbClOH
    Habit: Bladed
    Colour: White-colourless
    Description: Colourless to white 1cm bladed xl mass (XRD), associated with caledonite, and cerussite. Ex Steve Burchmore specimen.
    Reference: [UKJMM]
    Site Photo
    Eaglebrook Mine (Nant-Y-Cagel Mine; Nantycagl Mine; Nantygagal Mine; Dolrhyddlan Mine), Nant-y-Moch Reservoir area, Talybont, Ceulanymaesmawr, Ceredigion (Dyfed; Cardiganshire), Wales, UK
    © Steve Rust
  		•  Lautenthalite
    PbCu
     
    4
    		(SO
     
    4
    		)
     
    2
    		(OH)
     
    6
    		·3H
     
    2
    		O
    Habit: Bladed-platy
    Colour: Emerald green
    Description: Emerald green to 1mm (nice micros)1st UK occurrence. commonly found in parallel growth with wroewolfeite. (XRD on Peter Wallace specimen)
    Reference: []
    Site Photo
    Eaglebrook Mine (Nant-Y-Cagel Mine; Nantycagl Mine; Nantygagal Mine; Dolrhyddlan Mine), Nant-y-Moch Reservoir area, Talybont, Ceulanymaesmawr, Ceredigion (Dyfed; Cardiganshire), Wales, UK
    © Steve Rust
  		•  Leadhillite ?
    Pb
     
    4
    		SO
     
    4
    		(CO
     
    3
    		)
     
    2
    		(OH)
     
    2
    Description: Leadhillite specimens from this mine may be the polymorph susannite. As is the case in most mid-Wales mines.
    Reference: [BMS Database]
  		•  Limonite
    FeO(OH)·nH
     
    2
    		O
    Reference: [BMS Database]
  		•  Linarite
    PbCu[(OH)
     
    2
    		|SO
     
    4
    		]
    Habit: Bladed, prismatic
    Colour: Azur Blue
    Description: Deep blue to blue xls to 4mm (nice micros), associated with most othere superegene species.
    Reference: [BMS Database]
    Site Photo
    Eaglebrook Mine (Nant-Y-Cagel Mine; Nantycagl Mine; Nantygagal Mine; Dolrhyddlan Mine), Nant-y-Moch Reservoir area, Talybont, Ceulanymaesmawr, Ceredigion (Dyfed; Cardiganshire), Wales, UK
    © Steve Rust
  		•  Malachite
    Cu
     
    2
    		[(OH)
     
    2
    		|CO
     
    3
    		]
    Habit: Botryoidal, drusy
    Colour: Green
    Description: Green balls & xls to 2mm+, associated with most othere species.
    Reference: [BMS Database]
    Site Photo
    Eaglebrook Mine (Nant-Y-Cagel Mine; Nantycagl Mine; Nantygagal Mine; Dolrhyddlan Mine), Nant-y-Moch Reservoir area, Talybont, Ceulanymaesmawr, Ceredigion (Dyfed; Cardiganshire), Wales, UK
    © Steve Rust
  		•  Marcasite
    FeS
     
    2
    Habit: Typical habits
    Reference: [BMS Database]
  		•  Mattheddleite
    Pb
     
    5
    		(Si
     
    1.5
    		S
     
    1.5
    		)O
     
    12
    		(Cl,OH)
    Habit: Prismatic
    Colour: Colourless
    Description: Identified by visual comparason with confirmed mattheddleite, from other mid-Wales mines, and by association.
    Reference: [S.Rust collection]
  		•  Millerite
    NiS
    Habit: Prismatic
    Description: Millerite is found as wire-like contorted crystals to 1cm+ in veinstone.
    Reference: [BMS Database]
    Site Photo
    Eaglebrook Mine (Nant-Y-Cagel Mine; Nantycagl Mine; Nantygagal Mine; Dolrhyddlan Mine), Nant-y-Moch Reservoir area, Talybont, Ceulanymaesmawr, Ceredigion (Dyfed; Cardiganshire), Wales, UK
    © Steve Rust
  		•  Phosgenite
    Pb
     
    2
    		[Cl
     
    2
    		|CO
     
    3
    		]
    Habit: Prismatic rods, blocky pseudocubic.
    Colour: White-colourless, tinted brown.
    Description: Translucent tinted brown xls to 1mm, associated with cerussite.
    Reference: [S Rust Collection]
    Site Photo
    Eaglebrook Mine (Nant-Y-Cagel Mine; Nantycagl Mine; Nantygagal Mine; Dolrhyddlan Mine), Nant-y-Moch Reservoir area, Talybont, Ceulanymaesmawr, Ceredigion (Dyfed; Cardiganshire), Wales, UK
    © Steve Rust
  		•  Pyrite
    FeS
     
    2
    Habit: Cubes, veinlets
    Reference: [BMS Database]
  		•  Pyrolusite
    MnO
     
    2
    Reference: []
  		•  Pyromorphite
    Pb
     
    5
    		[Cl|(PO
     
    4
    		)
     
    3
    		]
    Habit: Typical habits
    Colour: Pale green, almost colourless
    Description: Greenish xls to 0.75mm.
    Reference: [BMS Database]
    Site Photo
    Eaglebrook Mine (Nant-Y-Cagel Mine; Nantycagl Mine; Nantygagal Mine; Dolrhyddlan Mine), Nant-y-Moch Reservoir area, Talybont, Ceulanymaesmawr, Ceredigion (Dyfed; Cardiganshire), Wales, UK
    © Steve Rust
  		•  Quartz
    SiO
     
    2
    Habit: Massive
    Reference: [BMS Database]
  		•  Ramsbeckite
    (Cu,Zn)
     
    15
    		[(OH)
     
    22
    		|(SO
     
    4
    		)
     
    4
    		] · 6H
     
    2
    		O
    Habit: Pseudorhombic
    Colour: Emerald green
    Description: Emerald green xls to 0.4mm, associated with schulenbergite, linarite, langite.
    Reference: [BMS Database]
  		•  Redgillite
    Cu
     
    6
    		[(OH)
     
    10
    		|SO
     
    4
    		] · H
     
    2
    		O
    Habit: Lath-like
    Colour: Pale green,green
    Reference: [S. Rust collection; Pluth, J. J., Steele, I. M., Kampf, A. R. & Green, D. I. (2005): Redgillite, Cu6(OH)10(SO4)•H2O, a new mineral from Caldbeck Fells, Cumbria, England: description and crystal structure. Mineralogical Magazine, 69, 973-980. ]
    Site Photo
    Eaglebrook Mine (Nant-Y-Cagel Mine; Nantycagl Mine; Nantygagal Mine; Dolrhyddlan Mine), Nant-y-Moch Reservoir area, Talybont, Ceulanymaesmawr, Ceredigion (Dyfed; Cardiganshire), Wales, UK
    © Steve Rust
  		•  Schmiederite ?
    Pb
     
    2
    		Cu
     
    2
    		[(OH)
     
    4
    		|SeO
     
    3
    		|SeO
     
    4
    		]
    Description: Solid solution with linarite
    Reference: [BMS Database]
  		•  Schulenbergite
    (Cu,Zn)
     
    7
    		[(OH)
     
    10
    		|(SO
     
    4
    		,CO
     
    3
    		)
     
    2
    		] · 3H
     
    2
    		O
    Habit: Petal-like
    Colour: Pale blue
    Description: Pale blue platy xl rossets to 0.4mm, associated with langite, linarite, ramsbeckite.
    Reference: [BMS Database]
  		•  Serpierite
    Ca(Cu,Zn)
     
    4
    		(SO
     
    4
    		)
     
    2
    		(OH)
     
    6
    		·3H
     
    2
    		O
    Habit: Divergent, lath like
    Colour: Almost white to sky blue
    Description: Lath like xls to 1mm in masses (nice micros), associated with most othere supergene species.
    Reference: [BMS Database]
    Site Photo
    Eaglebrook Mine (Nant-Y-Cagel Mine; Nantycagl Mine; Nantygagal Mine; Dolrhyddlan Mine), Nant-y-Moch Reservoir area, Talybont, Ceulanymaesmawr, Ceredigion (Dyfed; Cardiganshire), Wales, UK
    © Steve Rust
  		•  Siderite ?
    FeCO
     
    3
    Reference: [BMS Database]
  		•  Siegenite
    from CoNi
     
    2
    		S
     
    4
    		 to NiCo
     
    2
    		S
     
    4
    Description: In polished ore samples
    Reference: [BMS Database]
  		•  Smithsonite
    ZnCO
     
    3
    Reference: [BMS Database]
  		•  Sphalerite
    (Zn,Fe
    2+
     
    		)S
    Habit: Massive
    Colour: Brown
    Reference: [BMS Database]
  		•  Sulphur
    S
     
    8
    Habit: Rounded
    Colour: Light greenish yellow-yellow
    Description: Xls to 0.5mm, associated with altered galena.
    Reference: [S Rust Collection.]
  		•  Susannite
    Pb
     
    4
    		SO
     
    4
    		(CO
     
    3
    		)
     
    2
    		(OH)
     
    2
    Habit: Platy, blocky pseudohexagonal
    Colour: Colourless-white
    Description: Xls to 0.3mm
    Reference: [S Rust collection]
    Site Photo
    Eaglebrook Mine (Nant-Y-Cagel Mine; Nantycagl Mine; Nantygagal Mine; Dolrhyddlan Mine), Nant-y-Moch Reservoir area, Talybont, Ceulanymaesmawr, Ceredigion (Dyfed; Cardiganshire), Wales, UK
    © Steve Rust
  		•  Tučekite
    Ni
     
    9
    		Sb
     
    2
    		S
     
    8
    Habit: Imbeded crystals
    Description: Micron crystals in polished ore samples
    Reference: [BMS Database]
  		•  'Unnamed (Basic Zinc Sulfate Hydrate)'
    Zn
     
    4
    		SO
     
    4
    		(OH)
     
    6
    		·4H
     
    2
    		O
    Habit: Very thin platy petal-like microcrystals
    Colour: Very pale sea green
    Reference: [Nat Hist London XRD file X4588F]
    Site Photo
    Eaglebrook Mine (Nant-Y-Cagel Mine; Nantycagl Mine; Nantygagal Mine; Dolrhyddlan Mine), Nant-y-Moch Reservoir area, Talybont, Ceulanymaesmawr, Ceredigion (Dyfed; Cardiganshire), Wales, UK
    © Steve Rust
  		•  'Wad'
    Reference: []
  		•  Woodwardite
    Cu
     
    4
    		Al
     
    2
    		[(OH)
     
    12
    		|SO
     
    4
    		] · 2-4H
     
    2
    		O
    Reference: [BMS Database]
  		•  Wroewolfeite
    Cu
     
    4
    		[(OH)
     
    6
    		|SO
     
    4
    		] · 2H
     
    2
    		O
    Habit: Tabular, bladed.
    Colour: Light-deep blue green
    Description: Blue green platy and prismatic xls to 1.5mm (nice micros), associated with many of the supergene species.
    Reference: [BMS Database]
    Site Photo
    Eaglebrook Mine (Nant-Y-Cagel Mine; Nantycagl Mine; Nantygagal Mine; Dolrhyddlan Mine), Nant-y-Moch Reservoir area, Talybont, Ceulanymaesmawr, Ceredigion (Dyfed; Cardiganshire), Wales, UK
    © Steve Rust
  		•  Wulfenite
    Pb[MoO
     
    4
    		]
    Habit: Tabular
    Colour: Orange
    Reference: [BMS Database]


    59 entries listed. 56 valid minerals.

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