PMN Anti-Personnel Mine

Ordnance Overview

The PMN (Protivopekhotnaya Mina Nazhimnogo Deystviya – Anti-Personnel Mine with Pressure Action) is a Soviet-designed blast anti-personnel mine that became one of the most widely produced and deployed landmines in history. Characterized by its simple, rugged design and devastating effectiveness, the PMN represents the Soviet philosophy of creating cheap, reliable weapons that could be mass-produced and deployed in enormous quantities. Its widespread use across multiple conflicts and its continued presence as unexploded ordnance make it one of the most significant humanitarian threats in former conflict zones worldwide.

Country/Bloc of Origin

  • Country: Soviet Union (USSR)
  • Development Period: 1950s (entered service in 1955)
  • Bloc: Warsaw Pact countries
  • International Production: Licensed and copied by numerous countries including:
    • China (Type 58)
    • Iraq
    • North Korea
    • Vietnam
    • Former Yugoslavia
    • Egypt
    • Multiple other nations produced unlicensed copies

Ordnance Class

  • Type: Landmine
  • Primary Role: Anti-Personnel (AP) blast mine
  • Sub-Category: Pressure-activated blast mine
  • Deployment Method: Hand-emplaced, surface-laid or buried
  • Target: Personnel/infantry
  • Effect: Blast injury to lower extremities, typically severe foot/leg amputation

Ordnance Family/Nomenclature

Official Designations:

  • PMN: Primary Soviet designation
  • Type 58: Chinese designation for their licensed copy
  • Designation variations: Various copies exist with slight modifications

Common Names:

  • “Black Widow” (informal nickname due to high casualty rate)
  • Sometimes referred to simply as “pressure mine”

Related Family Members:

  • PMN-2: Modernized version with improved design
  • PMN-3: Further development (limited production)
  • PMN-4: Modern variant

NATO Stock Numbers:

  • Various numbers assigned based on source country

Physical Markings:

  • Typically marked with Cyrillic characters indicating manufacture
  • Manufacturing codes and year stamps on some variants
  • Many copies produced without markings

Hazards

Primary Hazards

Blast Effects:

  • Contains 240 grams (8.5 oz) of TNT main charge
  • Designed to destroy or severely damage the foot and lower leg
  • Blast effect extends approximately 2 meters (6.5 feet) with potential for injury
  • Primary effect: traumatic amputation of foot/leg below knee
  • Secondary effects: severe fragmentation wounds from soil and debris

Activation Sensitivity:

  • Operating Pressure: 5-25 kg (11-55 lbs) – relatively low pressure
  • Can be triggered by human footfall (adult weight ~70-80kg easily exceeds threshold)
  • Some degraded examples may become more sensitive over time

Environmental Considerations:

  • Extremely Stable: Bakelite (phenolic resin) case resists environmental degradation
  • Can remain functional for decades after emplacement
  • Water resistant due to sealed construction
  • Temperature extremes have minimal effect on reliability
  • Resistant to biological degradation

UXO Concerns:

  • High Danger: All PMN mines should be treated as live regardless of age
  • No self-destruct mechanism – remains dangerous indefinitely
  • Difficult to detect: minimal metal content (only 7-gram steel firing pin)
  • Commonly encountered in:
    • Afghanistan (millions laid during Soviet occupation)
    • Cambodia
    • Angola
    • Former Yugoslavia
    • Middle East conflict zones
    • East Africa

Special Hazards:

  • Metal detector avoidance: Minimal metal signature makes detection difficult
  • Cluster deployment: Often laid in large fields making clearance dangerous
  • Booby-trap potential: Can be modified with anti-handling devices (though not standard)
  • Degradation risk: Aging mines may develop unstable fuzing
Kill/Injury Radius
  • Lethal radius: Contact to 0.5 meters
  • Severe injury radius: 0.5 to 2 meters
  • Fragmentation hazard: 2 to 5 meters (from debris and soil)

Key Identification Features

Physical Dimensions
  • Diameter: 112 mm (4.4 inches)
  • Height: 56 mm (2.2 inches)
  • Weight: Approximately 550 grams (1.2 lbs)
  • Explosive Content: 240 grams TNT
Visual Characteristics

Shape:

  • Circular, flat cylinder
  • Distinctive two-piece construction
  • Top pressure plate with central depression
  • Bottom body section with mounting flange

Color:

  • Standard: Black or very dark brown/green
  • Made from Bakelite (phenolic resin plastic)
  • Surface often has matte finish
  • Color may fade to dark gray/brown with UV exposure

Construction Materials:

  • Body: Bakelite (early thermoplastic)
  • Pressure plate: Bakelite
  • Firing pin: Steel (approximately 7 grams – only metal component)
  • Detonator: Sensitive explosive
  • Main charge: Pressed TNT

Distinctive Features:

  • Central pressure plate: Circular, slightly domed with compression spring underneath
  • Safety pin hole: Visible on side (when armed, safety pin removed)
  • Seam line: Visible joint between top and bottom halves
  • Mounting flange: Slight lip around bottom edge
  • Weathering pattern: Tends to show surface crazing and cracking with age

Markings:

  • Manufacturing marks: Cyrillic text (often worn or absent)
  • Lot numbers: May be stamped on base
  • Date codes: Sometimes present
  • Warning symbols: Not standard on original Soviet production
Field Identification Tips
  • If black/dark plastic circular object ~11cm diameter found in conflict area → treat as PMN
  • Minimal metal signature on detectors (only tiny firing pin)
  • Often partially buried with pressure plate visible
  • May have vegetation growing around/through mounting holes

Fuzing Mechanisms

Primary Fuze System

Type: Mechanical pressure fuze (MUV fuze series)

Components:

  1. Pressure plate (top surface)
  2. Compression spring
  3. Striker/firing pin (only metal component)
  4. Detonator (initiates main charge)
  5. Safety pin (prevents accidental activation)
Arming Sequence

Safe State:

  1. Mine delivered with safety pin inserted through pressure plate mechanism
  2. Safety pin prevents striker from moving toward detonator
  3. Compression spring is compressed but held by safety pin

Arming Procedure:

  1. Operator places mine in desired location
  2. Safety pin is removed through side hole
  3. Striker is now restrained only by compression spring tension
  4. Mine is immediately live and ready to function

Critical Safety Note: There is no time delay – once safety pin is removed, the mine is armed.

Activation/Functioning

Trigger Mechanism:

  1. Pressure applied to top plate (5-25 kg force)
  2. Pressure plate compresses, overcoming spring resistance
  3. Pressure plate moves downward ~4-6mm
  4. This releases the striker
  5. Striker driven by compression force onto detonator
  6. Detonator initiates main TNT charge
  7. Total time from pressure to detonation: ~0.01 seconds
Safety Features

Safety Pin:

  • Only safety mechanism
  • Must be manually removed to arm
  • Cannot be reinserted easily once removed
  • Physical barrier preventing striker movement

Design Note: The PMN has minimal safety features – this is intentional for:

  • Simplicity of manufacture
  • Reliability of function
  • Ease of deployment
  • Low production cost
Notable Characteristics

Strengths:

  • Extremely simple and reliable mechanism
  • Very few moving parts (reduces failure rate)
  • Requires minimal maintenance
  • Functions reliably after decades

Weaknesses (from military perspective):

  • No self-destruct mechanism (creates long-term UXO problem)
  • No anti-handling device (can be removed by trained personnel)
  • No electronic components (no remote disabling possible)

No Anti-Handling Device (standard):

  • Original design has no anti-disturbance features
  • Can be fitted with improvised AHDs but this is non-standard
  • Removal requires standard mine clearing procedures

History of Development and Use

Development Background

Origins (1940s-1950s):

  • Developed in the early 1950s by Soviet military engineers
  • Response to lessons learned from World War II regarding mine warfare
  • Designed to replace older, less reliable mine designs
  • Goal: Create mass-producible, highly reliable AP mine for large-scale deployment

Design Philosophy:

  • Extreme simplicity for ease of manufacture
  • Low cost per unit enabling mass production
  • Reliability over sophistication
  • Suited for rapid deployment by regular infantry
  • Minimal training required for emplacement

Production and Deployment

Manufacturing:

  • Production began: 1955
  • Production scale: Estimated 10-15 million units manufactured by Soviet Union
  • Total global production: Possibly 50+ million units including all copies
  • Continued production through 1980s in USSR
  • Still being manufactured by some countries into 21st century

Massive Distribution: The PMN became one of the most widely distributed weapons in history:

  • Supplied to all Warsaw Pact nations
  • Provided to numerous communist and allied nations
  • Licensed production in China (Type 58)
  • Copies produced by multiple nations without license
Combat History

Major Conflicts:

Afghanistan War (1979-1989):

  • Soviet forces laid millions of PMN mines
  • Extensive use across countryside and mountain paths
  • Major cause of civilian casualties during and after conflict
  • Remains primary UXO threat in Afghanistan today

Vietnam War:

  • Used extensively by North Vietnamese and Viet Cong forces
  • Laid along trails and in defensive perimeters
  • Continued to cause casualties long after war ended

Middle Eastern Conflicts:

  • Iran-Iraq War (1980-1988): massive deployment by both sides
  • Various Arab-Israeli conflicts
  • Lebanese Civil War
  • Gulf Wars (Iraqi forces used extensively)

African Conflicts:

  • Angolan Civil War (1975-2002)
  • Mozambique Civil War
  • Eritrean-Ethiopian conflicts
  • Numerous other regional conflicts

Balkan Conflicts:

  • Yugoslav Wars (1991-2001)
  • Extensive use throughout former Yugoslavia
  • Major clearance operations continue today
Long-Term Impact

Humanitarian Crisis:

  • Continues to kill and maim civilians decades after conflicts end
  • Estimated millions remain in ground worldwide
  • Major impediment to:
    • Agricultural development
    • Infrastructure reconstruction
    • Safe refugee return
    • Economic development

Clearance Challenges:

  • Low metal content makes detection difficult
  • Extreme durability means mines remain functional for 40+ years
  • High concentrations in some areas (hundreds per square kilometer)
  • Clearance is slow, dangerous, and expensive

Current Status:

  • Officially obsolete in Russian military (replaced by PMN-2 and newer designs)
  • Still in stockpiles of numerous nations
  • Continued encounters in clearance operations worldwide
  • Symbol of landmine crisis leading to Ottawa Treaty (1997 Mine Ban Treaty)
Tactical Impact

Military Effectiveness:

  • Extremely effective at area denial
  • Created psychological impact on enemy forces
  • Channeled enemy movement into kill zones
  • Cheap force multiplier

Doctrine Influence:

  • Established Soviet/Russian doctrine of mass mine deployment
  • Influenced design of subsequent mine generations
  • Demonstrated effectiveness of simple, reliable design over complex systems

Technical Specifications

Explosive Characteristics

Main Charge:

  • Type: TNT (Trinitrotoluene)
  • Weight: 240 grams (8.5 oz)
  • Form: Pressed TNT cake
  • Detonation Velocity: ~6,900 m/s (TNT standard)
  • Blast Pressure: Sufficient to sever foot/leg

Detonator:

  • Type: Sensitive primary explosive
  • Location: Central, beneath pressure plate
  • Purpose: Initiates main TNT charge
Physical Characteristics

Overall Dimensions:

  • Diameter: 112 mm (4.4 in)
  • Height: 56 mm (2.2 in)
  • Weight (total): 550 grams (1.2 lbs)
  • Weight (explosive): 240 grams

Material Composition:

  • Body/case: Bakelite (phenolic resin – early thermoset plastic)
  • Advantages of Bakelite:
    • Resistant to environmental degradation
    • Non-metallic (avoids detection)
    • Easy to mold/manufacture
    • Inexpensive
    • Durable in various climates

Metal Content:

  • Total metal: ~7 grams (firing pin only)
  • Detection signature: Very low – difficult for standard metal detectors
  • Modern detection: Requires ground-penetrating radar or advanced sensors
Operating Parameters

Activation Pressure:

  • Specification Range: 5-25 kg (11-55 lbs)
  • Typical Setting: ~8-16 kg
  • Notes: Sufficient to be triggered by adult human footfall, generally resistant to small animals

Environmental Tolerance:

  • Operating Temperature: -40°C to +60°C (-40°F to +140°F)
  • Storage Temperature: Same as operating range
  • Humidity: Sealed construction, functions in high humidity
  • Water Resistance: Can function when submerged or in mud
  • Shelf Life: Indefinite (no degrading components)
  • Functional Life: Decades after emplacement
Deployment Specifications

Emplacement Time:

  • Per mine: 30-60 seconds for trained personnel
  • Method: Hand-placed
  • Concealment: Can be surface-laid or buried up to 5-10cm depth

Density:

  • Typical deployment: 1-3 mines per meter in defensive lines
  • Pattern: Random, row, or combination patterns
  • Coverage: Can create extensive minefields quickly with infantry units

Frequently Asked Questions

Q: Why is the PMN mine so difficult to detect with metal detectors?

A: The PMN contains only about 7 grams of metal (the small firing pin), which is far below the threshold of most standard metal detectors. This was an intentional design feature by Soviet engineers. The entire body, pressure plate, and structural components are made of Bakelite plastic, making the mine effectively “invisible” to traditional metal detection equipment. This requires clearance teams to use more sophisticated detection methods such as ground-penetrating radar (GPR), prodding techniques, or trained mine detection dogs. This minimal metal signature was revolutionary in the 1950s and made the PMN exceptionally difficult to clear, contributing to its long-term humanitarian impact.

Q: How does the PMN compare to its successor, the PMN-2?

A: While both mines share similar operating principles, the PMN-2 incorporated several improvements over the original PMN. The PMN-2 features a more modern plastic body (not Bakelite), improved waterproofing, and a more consistent fuzing mechanism. However, the fundamental difference lies in their detectability: the PMN-2 was designed to be even harder to detect than the original PMN. From a humanitarian perspective, both mines present similar long-term threats, but the PMN-2’s improved reliability means it’s more likely to remain functional decades after emplacement. The PMN-2 also has a slightly different pressure plate design and improved resistance to accidental activation, though both mines remain extremely dangerous.

Q: Why was the PMN designed with such minimal safety features?

A: The PMN’s limited safety features (only a removable safety pin) reflect Soviet military doctrine and design philosophy of the 1950s. The design priorities were: (1) extreme reliability and simplicity, (2) very low production cost, (3) ease of mass deployment, and (4) minimal training requirements for infantry troops laying mines. Including additional safety mechanisms like self-destruct timers or complex arming sequences would have increased cost, complexity, and potential points of failure. The Soviet military intended to deploy millions of these mines in potential future conflicts with NATO, where cost and quantity were more important than individual mine sophistication. Unfortunately, this design approach created the long-term humanitarian crisis of persistent landmines that remain deadly for decades.

Q: Can a PMN mine be safely disarmed or removed?

A: PMN mines can be safely neutralized and removed, but only by extensively trained Explosive Ordnance Disposal (EOD) personnel or qualified demining specialists using proper procedures and equipment. The standard approach involves careful detection, precise excavation around the mine without applying pressure to the plate, and either in-place destruction or careful transport to a disposal site. The greatest danger is applying pressure to the plate or disturbing it from the side (which could shift internal components). Civilians should NEVER attempt to handle, move, or disarm a suspected PMN mine. The proper action is to mark the area clearly, warn others, and immediately report the location to military or civilian authorities responsible for mine clearance. Even very old PMN mines retain their lethality.

Q: Why does the PMN remain functional after so many decades in the ground?

A: The PMN’s remarkable longevity results from several design characteristics. First, the Bakelite body is highly resistant to environmental degradation – it doesn’t rust, corrode, or significantly degrade from UV exposure, moisture, or temperature extremes. Second, the explosive fill (TNT) is extremely stable chemically and maintains its effectiveness for many decades. Third, the purely mechanical fuzing system has no batteries, electronics, or components that degrade over time – it’s simply a spring, striker, and pressure plate. Finally, the sealed construction prevents water and contaminants from entering and affecting the mechanism. These factors combine to create a weapon that can remain fully functional 40, 50, or even 60+ years after emplacement, creating a persistent threat to civilian populations long after conflicts end.

Q: What makes the PMN a “blast” mine rather than a “fragmentation” mine?

A: The PMN is classified as a blast mine because its primary kill/injury mechanism is the explosive shock wave and pressure from the 240-gram TNT charge, rather than pre-formed fragments or shrapnel. When the mine detonates, it creates an upward-directed blast cone that destroys or severely damages whatever triggered it – typically a human foot and lower leg. While the explosion does throw soil, rocks, and debris outward (creating secondary fragmentation effects), the mine doesn’t contain metal fragments, ball bearings, or pre-formed shrapnel like a true fragmentation mine. The distinction is important: blast mines like the PMN are designed to disable individual soldiers by destroying limbs, while fragmentation mines (like the POMZ-2) are designed to kill or wound multiple people within a radius using flying fragments. Both types are devastating, but they achieve their effects through different mechanisms.

Q: Why did so many countries choose to copy or license the PMN design?

A: The PMN became one of the most copied weapons systems in history for several compelling reasons. First, its extreme simplicity meant that even countries with limited industrial capacity could manufacture it – it required no sophisticated electronics, minimal precision machining, and used readily available materials. Second, the proven effectiveness of the design made it an attractive choice for military planners. Third, its low production cost (estimated at $3-10 per mine) meant even resource-limited nations could produce them in large quantities. Fourth, during the Cold War, the Soviet Union actively shared military technology with allied nations and communist movements worldwide, facilitating widespread adoption. Finally, the minimal metal content provided a significant tactical advantage that other mine designs couldn’t match at the time. China’s Type 58 copy alone was produced in quantities of millions, spreading the design throughout Asia and Africa. This proliferation has contributed to the global landmine crisis we face today.

Q: What role did the PMN play in the creation of the international Mine Ban Treaty?

A: The PMN mine, along with similar designs, became a symbol of the humanitarian landmine crisis that led to the 1997 Ottawa Treaty (formally the Convention on the Prohibition of the Use, Stockpiling, Production and Transfer of Anti-Personnel Mines and on their Destruction). The PMN’s characteristics – extreme durability, minimal detectability, mass deployment, and lack of self-destruct mechanisms – meant that millions of these mines remained in the ground decades after conflicts ended in Afghanistan, Cambodia, Angola, and elsewhere. The ongoing casualties from PMN mines, particularly among civilians and children, galvanized international advocacy groups and governments to pursue a comprehensive ban. Images of PMN mine victims and statistics about post-conflict casualties were central to the advocacy campaign. While major military powers like the US, Russia, and China did not sign the treaty, the PMN’s legacy of harm was instrumental in changing international norms regarding landmine use and spurring massive demining efforts worldwide. The mine essentially became the “poster child” for why anti-personnel mines needed to be banned.

Safety Reminder

All ordnance should be considered extremely dangerous until proven safe by qualified Explosive Ordnance Disposal (EOD) personnel. If you encounter suspected ordnance:

  1. DO NOT TOUCH OR MOVE IT
  2. Mark the location clearly and safely
  3. Warn others in the area
  4. Immediately report to local authorities, military, or police
  5. Evacuate the area if necessary

This information is provided for educational and identification purposes only. Mine clearance and disposal must only be performed by trained, certified professionals with proper equipment and authorization.