NLM-55DD82: Roman Iron Working Bloom

Rights Holder: North Lincolnshire Museum
CC License:

Image use policy

Our images can be used under a CC BY attribution licence (unless stated otherwise).


Unique ID: NLM-55DD82

Object type certainty: Certain
Workflow status: Awaiting validation Find awaiting validation

Iron metalworking debris. A large oval-ended furnace bottom or bloom [the finder's identification] with a flat top and near-vertical if irregular sides, formed either in the base of an iron ore burning furnace or in a channel cut to receive molten metal from such furnace. The object was retrieved from a reported depth of c.0.9m, and involved the cooperative labours of two people working at arms' length to extract it from the hole.

Dr Kevin Leahy kindly comments that the object has the superficial appearance of cast iron, and that this would carry with it an implication of a date after c.1490. The first recorded use of cast iron, under Henry VII (1485-1509), was for the manufacture of solid iron gun shot. Kevin adds that monastic involvement in the early manufacture of cast iron is suspected in some regions. Ad hoc testing with an angle grinder, which would result in sparks being generated by wrought iron [of potentially earlier date] or grey dust by cast iron [of later date, as is suspected from the form of the object], could resolve the nature of the material, but has not been attempted in this case. Suggested date: Post-Medieval, 1500-1650.

Length: 350mm, Width: 150mm, Thickness/Depth: 88mm, Mass: not weighed, estimated to be in considerable excess of 10kg.


After its first recovery, the object got no further than the nearest hedge bottom, whence it was recovered nearly a year later. The intervening period does not seem to have adversely affected its condition.

The nearby Iron Age, Romano-British [and to a much lesser extent Early Medieval] settlement at Dragonby is thought to have owed its importance to its access to local iron ore and control over its exploitation. Evidence for Romano-British activity is more widespread than for the earlier or later periods, and the find spot of this example is deemed a 'Roman site' by the finder.

Subsequent actions

Subsequent action after recording: Donated to a museum


Broad period: POST MEDIEVAL
Period from: POST MEDIEVAL
Date from: Circa AD 1500
Date to: Circa AD 1650

Dimensions and weight

Quantity: 1
Length: 350 mm
Width: 150 mm
Weight: 88 g

Discovery dates

Date(s) of discovery: Monday 14th August 2017

Personal details

Found by: This information is restricted for your login.
Recorded by: Mr Martin Foreman
Identified by: Mr Martin Foreman
Secondary identifier: Dr Kevin Leahy

Other reference numbers

Other reference: NLM36973

Materials and construction

Primary material: Iron
Completeness: Complete

Spatial metadata

Region: Yorkshire and the Humber (European Region)
County or Unitary authority: North Lincolnshire (Unitary Authority)
District: North Lincolnshire (Unitary Authority)
Parish or ward: Roxby cum Risby (Civil Parish)

Spatial coordinates

4 Figure: SE9115
Four figure Latitude: 53.62363868
Four figure longitude: -0.62559342
1:25K map: SE9115
1:10K map: SE91NW
Grid reference source: GPS (from the finder)
Unmasked grid reference accurate to a 1 metre square.

Discovery metadata

Method of discovery: Metal detector
General landuse: Cultivated land

References cited

No references cited so far.

Similar objects

Find number: CORN-6217F4
Object type: BLOOM
Broadperiod: IRON AGE
Bloom of impure iron solidified on a flat surface to form the plano-convex profile and ovate section. The bloom is partly magnetic suggesting …
Workflow: Awaiting validationFind awaiting validation

Find number: NLM-5C273A
Object type: VESSEL
Broadperiod: ROMAN
Copper alloy possible vessel mount. Curved cast object of oval section with a short lug protruding from its widest end. The object diminishes…
Workflow: Awaiting validationFind awaiting validation

Find number: HESH-C26546
Object type: BLOOM
Broadperiod: MEDIEVAL
An iron ingot or billet formed from a hammer shaped bloom of probable Early Medieval - early Post Medieval date (AD 550-1550). The ingot is br…
Workflow: PublishedFind published

Timeline of associated dates

Audit data

Recording Institution: NLM
Created: About one year ago
Updated: About one year ago

Other formats: this page is available as qrcode json xml geojson pdf rdf representations.